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New 12.1 Dataset Interactive Controls and Formatting Options

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In his blog post announcing the launch of Mathematica Version 12.1, Stephen Wolfram mentioned the extensive updates to Dataset that we undertook to make it easier to explore, understand and present your data. Here is how the updated Dataset works and how you can use it to gain deeper insight into your data.

New Interactive Features

We have added items to Dataset column header context menus for sorting and reverse sorting your data:

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If a Dataset has multiple levels of data, you can sort multiple columns simultaneously:

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Sort row headers by hovering near the corner of the blank cell atop a row header column. When the menu indicator () appears, right-click it to bring up the context menu and choose a sort item:

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Hide and Show items are also in the context menus of all Dataset cells, used to collapse parts of datasets for focused views of particular data:

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All the Options

Sorting and hiding give you interactive tools for exploring your data. With Dataset’s new formatting options, you can present your data in ways that make it easier to understand and spot patterns.

The following is a complete set of new Dataset options:

Alignment
Background
ItemSize
ItemStyle
 		Grid-like formatting for Dataset items
HeaderAlignment
HeaderBackground
HeaderSize
HeaderStyle
 		Grid-like formatting for Dataset headers
ItemDisplayFunction
HeaderDisplayFunction
 		complete control of item and header formatting
HiddenItems
 		which items are initially hidden
MaxItems
 		maximum number of items to display without a scrollbar or elision
DatasetDisplayPanel
 initial drill-down position
ScrollPosition
 initial scroll positions

In the subsequent sections, I’ll explain the basic functions of these options and then do a deep dive into option value syntax. It lets you apply option values to Dataset data in tons of useful ways.

Alignment, Background, ItemSize, ItemStyle and Their Header Equivalents

These options, familiar from Grid, now work in Dataset as well. Here is a dataset with default styling:

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Here is the same Dataset with right-aligned ages, orange backgrounds and italic “children” entries (to change a Dataset’s options, wrap it with Dataset[...] and specify the new options):

Engage with the code in this post by downloading the Wolfram Notebook
Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Alignment -> {"age" -> Right},
 Background -> LightOrange,
 ItemStyle -> {"children" -> Italic}]

Each of the styling options has an analogous header option that operates on the Dataset’s headers rather than the items:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Alignment -> {"age" -> Right},
 Background -> LightOrange,
 ItemStyle -> {"children" -> Italic},
 HeaderAlignment -> {"age" -> Right},
 HeaderBackground -> LightRed,
 HeaderStyle -> Bold]

ItemDisplayFunction, HeaderDisplayFunction

If the basic styling options don’t meet your needs, you can take complete control of item and header formatting with the ItemDisplayFunction and HeaderDisplayFunction options.

Here is an item display function that replaces “male” and “female” with the symbols for male and female, and a header display function that changes the “sex” headers accordingly:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]],
 ItemDisplayFunction -> {"sex" -> (If[# === 
        "male", \[Mars], \[Venus]] &)},
 HeaderDisplayFunction -> {"sex" -> ("\[Mars]/\[Venus]" &)}]

The display function is given three arguments: the item or header value, the path to the item or header and the entire dataset itself. Here is a header display function that uses the second (path) argument to highlight children with the same name as their parent:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]],
 HeaderDisplayFunction -> (If[MatchQ[#2, {x_, "children", x_}], 
     Style[#, Bold, Red], #] &)]

HiddenItems

Specify which Dataset items are initially hidden with the HiddenItems option:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 HiddenItems -> {"Eva", "sex"}]

To hide all items by default and unhide individual items, use All to hide everything and then make exceptions using path→False:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 HiddenItems -> {All, {"Bob"} -> False}]

Make exceptions to the exceptions to hide unhidden items using path→True:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 HiddenItems -> {All, {"Bob"} -> False, "sex" -> True}]

MaxItems

Pre-12.1, the only control you had over how many Dataset items were displayed was via Dataset`$DatasetTargetRowCount. In 12.1, the MaxItems option gives you control over the number of rows displayed as well as columns and deeper levels. To limit the number of rows displayed to 3, specify MaxItems→3:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Mercury" -> Association[
    "Radius" -> Quantity[2439.7`5., "Kilometers"], 
     "Moons" -> Association[]], 
   "Venus" -> Association[
    "Radius" -> Quantity[6051.85`5., "Kilometers"], 
     "Moons" -> Association[]], 
   "Earth" -> Association[
    "Radius" -> Quantity[
      6367.4446571000000000001`8.299868708313456, "Kilometers"], 
     "Moons" -> Association[
      "Moon" -> Association[
        "Mass" -> Quantity[
          7.3459006322855173653772`4.995678626217362*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1737.5`5., "Kilometers"]]]], 
   "Mars" -> Association[
    "Radius" -> Quantity[3385.595`4.298042852900571, "Kilometers"], 
     "Moons" -> Association[
      "Phobos" -> Association[
        "Mass" -> Quantity[
          1.0724880884600402`3.9586073148417724*^16, "Kilograms"], 
         "Radius" -> Quantity[11.1`3., "Kilometers"]], 
       "Deimos" -> Association[
        "Mass" -> Quantity[
          1.468340774924336`1.9995659225206786*^15, "Kilograms"], 
         "Radius" -> Quantity[6.2`2., "Kilometers"]]]], 
   "Jupiter" -> Association[
    "Radius" -> Quantity[69173.`5., "Kilometers"], 
     "Moons" -> Association[
      "Metis" -> Association[
        "Mass" -> Quantity[
          1.19864553055047796`0.9999565727231415*^17, "Kilograms"], 
         "Radius" -> Quantity[21.5`3., "Kilometers"]], 
       "Adrastea" -> Association[
        "Mass" -> Quantity[
          7.491534565940487`0.9999565727231415*^15, "Kilograms"], 
         "Radius" -> Quantity[8.2`2., "Kilometers"]], 
       "Amalthea" -> Association[
        "Mass" -> Quantity[
          2.067663540199574478`2.995678626217367*^18, "Kilograms"], 
         "Radius" -> Quantity[83.45`4., "Kilometers"]], 
       "Thebe" -> Association[
        "Mass" -> Quantity[
          1.49830691318809745`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[49.3`3., "Kilometers"]], 
       "Io" -> Association[
        "Mass" -> Quantity[
          8.9297833448203530011087`4.995678626217362*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1821.6`5., "Kilometers"]], 
       "Europa" -> Association[
        "Mass" -> Quantity[
          4.7986859848371340385365`4.995678626217362*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1560.8`5., "Kilometers"]], 
       "Ganymede" -> Association[
        "Mass" -> Quantity[
          1.48150100386563183602529`4.995678626217362*^23, 
           "Kilograms"], 
         "Radius" -> Quantity[2631.2`5., "Kilometers"]], 
       "Callisto" -> Association[
        "Mass" -> Quantity[
          1.07567783404752629528633`4.995678626217362*^23, 
           "Kilograms"], 
         "Radius" -> Quantity[2410.3`5., "Kilometers"]], 
       "Themisto" -> Association[
        "Mass" -> Quantity[
          6.89221180066526`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "Leda" -> Association[
        "Mass" -> Quantity[
          1.0937640466273112`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Himalia" -> Association[
        "Mass" -> Quantity[
          6.742381109346438525`1.999565922520683*^18, "Kilograms"], 
         "Radius" -> Quantity[85.`2., "Kilometers"]], 
       "Lysithea" -> Association[
        "Mass" -> Quantity[
          6.2928890353900092`1.999565922520683*^16, "Kilograms"], 
         "Radius" -> Quantity[18.`2., "Kilometers"]], 
       "Elara" -> Association[
        "Mass" -> Quantity[
          8.6901800964909652`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[43.`2., "Kilometers"]], 
       "S/2000 J11" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "S/2003 J12" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[1.`2., "Kilometers"]], 
       "Carpo" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Euporie" -> Association[
        "Mass" -> Quantity[
          1.4983069131881`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.`2., "Kilometers"]], 
       "S/2003 J3" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "S/2003 J18" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Orthosie" -> Association[
        "Mass" -> Quantity[
          1.4983069131881`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.`2., "Kilometers"]], 
       "Euanthe" -> Association[
        "Mass" -> Quantity[
          4.4949207395643`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.5`2., "Kilometers"]], 
       "Harpalyke" -> Association[
        "Mass" -> Quantity[
          1.19864553055047`0.9999565727231415*^14, "Kilograms"], 
         "Radius" -> Quantity[2.2`2., "Kilometers"]], 
       "Praxidike" -> Association[
        "Mass" -> Quantity[
          4.34509004824548`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.4`2., "Kilometers"]], 
       "Thyone" -> Association[
        "Mass" -> Quantity[
          8.9898414791287`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "S/2003 J16" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Iocaste" -> Association[
        "Mass" -> Quantity[
          1.94779898714453`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[2.6`2., "Kilometers"]], 
       "Mneme" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Hermippe" -> Association[
        "Mass" -> Quantity[
          8.9898414791287`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Thelxinoe" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Helike" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "Ananke" -> Association[
        "Mass" -> Quantity[
          2.9966138263761948`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[14.`2., "Kilometers"]], 
       "S/2003 J15" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Eurydome" -> Association[
        "Mass" -> Quantity[
          4.4949207395643`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.5`2., "Kilometers"]], 
       "Arche" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[1.5`2., "Kilometers"]], 
       "Herse" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Pasithee" -> Association[
        "Mass" -> Quantity[
          1.4983069131881`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.`2., "Kilometers"]], 
       "S/2003 J10" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Chaldene" -> Association[
        "Mass" -> Quantity[
          7.4915345659396`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.9`2., "Kilometers"]], 
       "Isonoe" -> Association[
        "Mass" -> Quantity[
          7.4915345659396`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.9`2., "Kilometers"]], 
       "Erinome" -> Association[
        "Mass" -> Quantity[
          4.4949207395643`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.6`2., "Kilometers"]], 
       "Kale" -> Association[
        "Mass" -> Quantity[
          1.4983069131881`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.`2., "Kilometers"]], 
       "Aitne" -> Association[
        "Mass" -> Quantity[
          4.4949207395643`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.5`2., "Kilometers"]], 
       "Taygete" -> Association[
        "Mass" -> Quantity[
          1.6481376045069`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[2.5`2., "Kilometers"]], 
       "S/2003 J9" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[1.`2., "Kilometers"]], 
       "Carme" -> Association[
        "Mass" -> Quantity[
          1.31851008360552575`1.9995659225206786*^17, "Kilograms"], 
         "Radius" -> Quantity[23.`2., "Kilometers"]], 
       "Sponde" -> Association[
        "Mass" -> Quantity[
          1.4983069131881`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[1.`2., "Kilometers"]], 
       "Megaclite" -> Association[
        "Mass" -> Quantity[
          2.09762967846334`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[2.7`2., "Kilometers"]], 
       "S/2003 J5" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "S/2003 J19" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "S/2003 J23" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Kalyke" -> Association[
        "Mass" -> Quantity[
          1.94779898714453`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[2.6`2., "Kilometers"]], 
       "Kore" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Pasiphae" -> Association[
        "Mass" -> Quantity[
          2.9966138263761949`1.9995659225206786*^17, "Kilograms"], 
         "Radius" -> Quantity[30.`2., "Kilometers"]], 
       "Eukelade" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "S/2003 J4" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Sinope" -> Association[
        "Mass" -> Quantity[
          7.4915345659404873`1.9995659225206786*^16, "Kilograms"], 
         "Radius" -> Quantity[19.`2., "Kilometers"]], 
       "Hegemone" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Aoede" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "Kallichore" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Autonoe" -> Association[
        "Mass" -> Quantity[
          8.9898414791287`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Callirrhoe" -> Association[
        "Mass" -> Quantity[
          8.69018009649097`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[4.3`2., "Kilometers"]], 
       "Cyllene" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "S/2003 J2" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]]]], 
   "Saturn" -> Association[
    "Radius" -> Quantity[57316.`5., "Kilometers"], 
     "Moons" -> Association[
      "Tarqeq" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "Pan" -> Association[
        "Mass" -> Quantity[
          4.944412813520729`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[12.8`3., "Kilometers"]], 
       "Daphnis" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.9`2., "Kilometers"]], 
       "Atlas" -> Association[
        "Mass" -> Quantity[
          2.097629678463337`1.9995659225206786*^15, "Kilograms"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Prometheus" -> Association[
        "Mass" -> Quantity[
          1.86689041383236942`3.9586073148417764*^17, "Kilograms"], 
         "Radius" -> Quantity[46.8`3., "Kilometers"]], 
       "Pandora" -> Association[
        "Mass" -> Quantity[
          1.49081537862215657`2.9956786262173587*^17, "Kilograms"], 
         "Radius" -> Quantity[40.6`3., "Kilometers"]], 
       "Epimetheus" -> Association[
        "Mass" -> Quantity[
          5.25905726529022205`2.9956786262173543*^17, "Kilograms"], 
         "Radius" -> Quantity[58.3`3., "Kilometers"]], 
       "Janus" -> Association[
        "Mass" -> Quantity[
          1.896856552096131371`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[90.4`3., "Kilometers"]], 
       "Aegaeon" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[0.25`2., "Kilometers"]], 
       "Mimas" -> Association[
        "Mass" -> Quantity[
          3.7907164903658865482`3.9586073148417764*^19, "Kilograms"], 
         "Radius" -> Quantity[198.8`4., "Kilometers"]], 
       "Methone" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[1.6`2., "Kilometers"]], 
       "Anthe" -> Association[
        "Mass" -> Quantity[5.`1.*^12, "Kilograms"], 
         "Radius" -> Quantity[1.`1., "Kilometers"]], 
       "Pallene" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.6`2., "Kilometers"]], 
       "Enceladus" -> Association[
        "Mass" -> Quantity[
          1.08027928440861826137`3.9586073148417764*^20, "Kilograms"],
          "Radius" -> Quantity[252.3`4., "Kilometers"]], 
       "Tethys" -> Association[
        "Mass" -> Quantity[
          6.17452278924814959099`4.6989700043360205*^20, "Kilograms"],
          "Radius" -> Quantity[536.3`4., "Kilometers"]], 
       "Calypso" -> Association[
        "Mass" -> Quantity[
          3.595936591651433`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[9.5`2., "Kilometers"]], 
       "Telesto" -> Association[
        "Mass" -> Quantity[
          7.191873183302868`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[12.`2., "Kilometers"]], 
       "Polydeuces" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[1.2`2., "Kilometers"]], 
       "Dione" -> Association[
        "Mass" -> Quantity[
          1.095457133439213688532`4.6989700043360205*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[562.5`4., "Kilometers"]], 
       "Helene" -> Association[
        "Mass" -> Quantity[
          2.5471217524197656`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[16.`2., "Kilometers"]], 
       "Rhea" -> Association[
        "Mass" -> Quantity[
          2.308441461148901741032`4.6989700043360205*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[764.5`4., "Kilometers"]], 
       "Titan" -> Association[
        "Mass" -> Quantity[
          1.34520841449162446435527`4.958607314841778*^23, 
           "Kilograms"], 
         "Radius" -> Quantity[2575.5`5., "Kilometers"]], 
       "Hyperion" -> Association[
        "Mass" -> Quantity[
          5.543735578795960565`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[133.`4., "Kilometers"]], 
       "Iapetus" -> Association[
        "Mass" -> Quantity[
          1.805459830391657427108`4.6989700043360205*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[734.5`4., "Kilometers"]], 
       "Kiviuq" -> Association[
        "Mass" -> Quantity[
          3.296275209013815`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[8.`1., "Kilometers"]], 
       "Ijiraq" -> Association[
        "Mass" -> Quantity[
          1.198645530550478`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[6.`1., "Kilometers"]], 
       "Phoebe" -> Association[
        "Mass" -> Quantity[
          8.287135536843366995`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[106.6`4., "Kilometers"]], 
       "Paaliaq" -> Association[
        "Mass" -> Quantity[
          8.240688022534537`1.999565922520683*^15, "Kilograms"], 
         "Radius" -> Quantity[11.`3., "Kilometers"]], 
       "Skathi" -> Association[
        "Mass" -> Quantity[
          3.146444517695`1.9995659225206786*^14, "Kilograms"], 
         "Radius" -> Quantity[4.`1., "Kilometers"]], 
       "Albiorix" -> Association[
        "Mass" -> Quantity[
          2.0976296784633363`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[16.`2., "Kilometers"]], 
       "S/2007 S2" -> Association[
        "Mass" -> Quantity[1.5`2.*^14, "Kilograms"], 
         "Radius" -> Quantity[3.`1., "Kilometers"]], 
       "Bebhionn" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Erriapo" -> Association[
        "Mass" -> Quantity[
          7.64136525725929`1.9995659225206914*^14, "Kilograms"], 
         "Radius" -> Quantity[5.`1., "Kilometers"]], 
       "Siarnaq" -> Association[
        "Mass" -> Quantity[
          3.8955979742890535`1.999565922520683*^16, "Kilograms"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Skoll" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Tarvos" -> Association[
        "Mass" -> Quantity[
          2.696952443738576`1.9995659225206786*^15, "Kilograms"], 
         "Radius" -> Quantity[7.5`2., "Kilometers"]], 
       "Greip" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2004 S13" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Hyrrokkin" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "Mundilfari" -> Association[
        "Mass" -> Quantity[
          2.09762967846334`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "S/2006 S1" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Jarnsaxa" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Narvi" -> Association[
        "Mass" -> Quantity[
          3.44610590033262`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "Bergelmir" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2004 S17" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Suttungr" -> Association[
        "Mass" -> Quantity[
          2.09762967846334`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "Hati" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2004 S12" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Bestla" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Farbauti" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Thrymr" -> Association[
        "Mass" -> Quantity[
          2.09762967846334`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "S/2007 S3" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.5`2., "Kilometers"]], 
       "Aegir" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2004 S7" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2006 S3" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Kari" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Fenrir" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Surtur" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Ymir" -> Association[
        "Mass" -> Quantity[
          4.944412813520729`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[9.`1., "Kilometers"]], 
       "Loge" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Fornjot" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]]]], 
   "Uranus" -> Association[
    "Radius" -> Quantity[25266.`5., "Kilometers"], 
     "Moons" -> Association[
      "Cordelia" -> Association[
        "Mass" -> Quantity[
          4.4949207395642923`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[20.1`3., "Kilometers"]], 
       "Ophelia" -> Association[
        "Mass" -> Quantity[
          5.3939048874771508`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[21.4`3., "Kilometers"]], 
       "Bianca" -> Association[
        "Mass" -> Quantity[
          9.2895028617662042`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[25.7`3., "Kilometers"]], 
       "Cressida" -> Association[
        "Mass" -> Quantity[
          3.43112283120074311`2.9956786262173587*^17, "Kilograms"], 
         "Radius" -> Quantity[39.8`3., "Kilometers"]], 
       "Desdemona" -> Association[
        "Mass" -> Quantity[
          1.78298522669383596`2.995678626217367*^17, "Kilograms"], 
         "Radius" -> Quantity[32.`3., "Kilometers"]], 
       "Juliet" -> Association[
        "Mass" -> Quantity[
          5.57370171705972251`2.9956786262173543*^17, "Kilograms"], 
         "Radius" -> Quantity[46.8`3., "Kilometers"]], 
       "Portia" -> Association[
        "Mass" -> Quantity[
          1.681100356597045339`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[67.6`3., "Kilometers"]], 
       "Rosalind" -> Association[
        "Mass" -> Quantity[
          2.54712175241976567`2.9956786262173587*^17, "Kilograms"], 
         "Radius" -> Quantity[36.`2., "Kilometers"]], 
       "Cupid" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[5.`2., "Kilometers"]], 
       "Belinda" -> Association[
        "Mass" -> Quantity[
          3.56597045338767194`2.995678626217367*^17, "Kilograms"], 
         "Radius" -> Quantity[40.3`3., "Kilometers"]], 
       "Perdita" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Puck" -> Association[
        "Mass" -> Quantity[
          2.893230649366216176`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[81.`2., "Kilometers"]], 
       "Mab" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[5.`2., "Kilometers"]], 
       "Miranda" -> Association[
        "Mass" -> Quantity[
          6.5925504180276287794`1.9995659225206872*^19, "Kilograms"], 
         "Radius" -> Quantity[235.8`4., "Kilometers"]], 
       "Ariel" -> Association[
        "Mass" -> Quantity[
          1.352971142608851997243`2.9956786262173587*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[578.9`4., "Kilometers"]], 
       "Umbriel" -> Association[
        "Mass" -> Quantity[
          1.171676006113092205807`2.9956786262173587*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[584.7`4., "Kilometers"]], 
       "Titania" -> Association[
        "Mass" -> Quantity[
          3.525516166731593299572`3.9586073148417764*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[788.9`4., "Kilometers"]], 
       "Oberon" -> Association[
        "Mass" -> Quantity[
          3.013095202421263971712`3.9586073148417764*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[761.4`4., "Kilometers"]], 
       "Francisco" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[11.`2., "Kilometers"]], 
       "Caliban" -> Association[
        "Mass" -> Quantity[
          7.34170387462167751`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[49.`2., "Kilometers"]], 
       "Stephano" -> Association[
        "Mass" -> Quantity[
          5.99322765275239`0.9999565727231373*^15, "Kilograms"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Trinculo" -> Association[
        "Mass" -> Quantity[
          7.49153456594048`0.9999565727231373*^14, "Kilograms"], 
         "Radius" -> Quantity[5.`1., "Kilometers"]], 
       "Sycorax" -> Association[
        "Mass" -> Quantity[
          5.378921818345269844`2.9956786262173627*^18, "Kilograms"], 
         "Radius" -> Quantity[95.`2., "Kilometers"]], 
       "Margaret" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Prospero" -> Association[
        "Mass" -> Quantity[
          2.0976296784633363`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[15.`2., "Kilometers"]], 
       "Setebos" -> Association[
        "Mass" -> Quantity[
          2.0976296784633363`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[15.`2., "Kilometers"]], 
       "Ferdinand" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]]]], 
   "Neptune" -> Association[
    "Radius" -> Quantity[24552.5`5., "Kilometers"], 
     "Moons" -> Association[
      "Naiad" -> Association[
        "Mass" -> Quantity[
          1.94779898714452669`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[33.`2., "Kilometers"]], 
       "Thalassa" -> Association[
        "Mass" -> Quantity[
          3.74576728297024363`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[41.`2., "Kilometers"]], 
       "Despina" -> Association[
        "Mass" -> Quantity[
          2.09762967846333643`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[75.`2., "Kilometers"]], 
       "Galatea" -> Association[
        "Mass" -> Quantity[
          3.745767282970243625`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[88.`2., "Kilometers"]], 
       "Larissa" -> Association[
        "Mass" -> Quantity[
          4.944412813520721585`1.999565922520683*^18, "Kilograms"], 
         "Radius" -> Quantity[97.`2., "Kilometers"]], 
       "Proteus" -> Association[
        "Mass" -> Quantity[
          5.0343112283120074311`2.995678626217367*^19, "Kilograms"], 
         "Radius" -> Quantity[210.`3., "Kilometers"]], 
       "Triton" -> Association[
        "Mass" -> Quantity[
          2.139432441341284348686`4.6989700043360205*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1353.4`5., "Kilometers"]], 
       "Nereid" -> Association[
        "Mass" -> Quantity[
          3.0865122411674807466`2.9956786262173587*^19, "Kilograms"], 
         "Radius" -> Quantity[170.`3., "Kilometers"]], 
       "Halimede" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[30.`2., "Kilometers"]], 
       "Sao" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Laomedeia" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Psamathe" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Neso" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[30.`2., "Kilometers"]]]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"Radius", "Moons"}, {
TypeSystem`Atom[
Quantity[1, "Kilometers"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"Mass", "Radius"}, {
TypeSystem`Atom[
Quantity[1, "Kilograms"]], 
TypeSystem`Atom[
Quantity[1, "Kilometers"]]}], TypeSystem`AnyLength]}], 8], 
Association["ID" -> 165317787556689]], MaxItems -> 3]

Give a list to specify limits at multiple levels (rows, columns):

Dataset
&#10005

Dataset[Dataset[
Association[
  "Mercury" -> Association[
    "Radius" -> Quantity[2439.7`5., "Kilometers"], 
     "Moons" -> Association[]], 
   "Venus" -> Association[
    "Radius" -> Quantity[6051.85`5., "Kilometers"], 
     "Moons" -> Association[]], 
   "Earth" -> Association[
    "Radius" -> Quantity[
      6367.4446571000000000001`8.299868708313456, "Kilometers"], 
     "Moons" -> Association[
      "Moon" -> Association[
        "Mass" -> Quantity[
          7.3459006322855173653772`4.995678626217362*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1737.5`5., "Kilometers"]]]], 
   "Mars" -> Association[
    "Radius" -> Quantity[3385.595`4.298042852900571, "Kilometers"], 
     "Moons" -> Association[
      "Phobos" -> Association[
        "Mass" -> Quantity[
          1.0724880884600402`3.9586073148417724*^16, "Kilograms"], 
         "Radius" -> Quantity[11.1`3., "Kilometers"]], 
       "Deimos" -> Association[
        "Mass" -> Quantity[
          1.468340774924336`1.9995659225206786*^15, "Kilograms"], 
         "Radius" -> Quantity[6.2`2., "Kilometers"]]]], 
   "Jupiter" -> Association[
    "Radius" -> Quantity[69173.`5., "Kilometers"], 
     "Moons" -> Association[
      "Metis" -> Association[
        "Mass" -> Quantity[
          1.19864553055047796`0.9999565727231415*^17, "Kilograms"], 
         "Radius" -> Quantity[21.5`3., "Kilometers"]], 
       "Adrastea" -> Association[
        "Mass" -> Quantity[
          7.491534565940487`0.9999565727231415*^15, "Kilograms"], 
         "Radius" -> Quantity[8.2`2., "Kilometers"]], 
       "Amalthea" -> Association[
        "Mass" -> Quantity[
          2.067663540199574478`2.995678626217367*^18, "Kilograms"], 
         "Radius" -> Quantity[83.45`4., "Kilometers"]], 
       "Thebe" -> Association[
        "Mass" -> Quantity[
          1.49830691318809745`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[49.3`3., "Kilometers"]], 
       "Io" -> Association[
        "Mass" -> Quantity[
          8.9297833448203530011087`4.995678626217362*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1821.6`5., "Kilometers"]], 
       "Europa" -> Association[
        "Mass" -> Quantity[
          4.7986859848371340385365`4.995678626217362*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1560.8`5., "Kilometers"]], 
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TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"Radius", "Moons"}, {
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TypeSystem`Assoc[
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TypeSystem`Struct[{"Mass", "Radius"}, {
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TypeSystem`Atom[
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Association["ID" -> 165317787556689]], MaxItems -> {3, 1}]

You can specify limits at any depth. Here, the number of each planet’s moons displayed is limited to 1:

Dataset
&#10005

Dataset[Dataset[
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       "Erriapo" -> Association[
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       "Fenrir" -> Association[
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       "Loge" -> Association[
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       "Fornjot" -> Association[
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TypeSystem`Assoc[
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TypeSystem`Assoc[
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Association["ID" -> 165317787556689]], 
 MaxItems -> {Automatic, Automatic, 1}]

DatasetDisplayPanel

When you click a Dataset header, you drill down to that level in the dataset:

alt

Specify the initial drill-down position directly with DatasetDisplayPanel, giving the path to drill down to:

Dataset
&#10005

Dataset[Dataset[
Association[
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        "Mass" -> Quantity[
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         "Radius" -> Quantity[2.7`2., "Kilometers"]], 
       "S/2003 J5" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "S/2003 J19" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "S/2003 J23" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Kalyke" -> Association[
        "Mass" -> Quantity[
          1.94779898714453`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[2.6`2., "Kilometers"]], 
       "Kore" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Pasiphae" -> Association[
        "Mass" -> Quantity[
          2.9966138263761949`1.9995659225206786*^17, "Kilograms"], 
         "Radius" -> Quantity[30.`2., "Kilometers"]], 
       "Eukelade" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "S/2003 J4" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Sinope" -> Association[
        "Mass" -> Quantity[
          7.4915345659404873`1.9995659225206786*^16, "Kilograms"], 
         "Radius" -> Quantity[19.`2., "Kilometers"]], 
       "Hegemone" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Aoede" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "Kallichore" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Autonoe" -> Association[
        "Mass" -> Quantity[
          8.9898414791287`0.9999565727231415*^13, "Kilograms"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Callirrhoe" -> Association[
        "Mass" -> Quantity[
          8.69018009649097`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[4.3`2., "Kilometers"]], 
       "Cyllene" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "S/2003 J2" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]]]], 
   "Saturn" -> Association[
    "Radius" -> Quantity[57316.`5., "Kilometers"], 
     "Moons" -> Association[
      "Tarqeq" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "Pan" -> Association[
        "Mass" -> Quantity[
          4.944412813520729`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[12.8`3., "Kilometers"]], 
       "Daphnis" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.9`2., "Kilometers"]], 
       "Atlas" -> Association[
        "Mass" -> Quantity[
          2.097629678463337`1.9995659225206786*^15, "Kilograms"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Prometheus" -> Association[
        "Mass" -> Quantity[
          1.86689041383236942`3.9586073148417764*^17, "Kilograms"], 
         "Radius" -> Quantity[46.8`3., "Kilometers"]], 
       "Pandora" -> Association[
        "Mass" -> Quantity[
          1.49081537862215657`2.9956786262173587*^17, "Kilograms"], 
         "Radius" -> Quantity[40.6`3., "Kilometers"]], 
       "Epimetheus" -> Association[
        "Mass" -> Quantity[
          5.25905726529022205`2.9956786262173543*^17, "Kilograms"], 
         "Radius" -> Quantity[58.3`3., "Kilometers"]], 
       "Janus" -> Association[
        "Mass" -> Quantity[
          1.896856552096131371`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[90.4`3., "Kilometers"]], 
       "Aegaeon" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[0.25`2., "Kilometers"]], 
       "Mimas" -> Association[
        "Mass" -> Quantity[
          3.7907164903658865482`3.9586073148417764*^19, "Kilograms"], 
         "Radius" -> Quantity[198.8`4., "Kilometers"]], 
       "Methone" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[1.6`2., "Kilometers"]], 
       "Anthe" -> Association[
        "Mass" -> Quantity[5.`1.*^12, "Kilograms"], 
         "Radius" -> Quantity[1.`1., "Kilometers"]], 
       "Pallene" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.6`2., "Kilometers"]], 
       "Enceladus" -> Association[
        "Mass" -> Quantity[
          1.08027928440861826137`3.9586073148417764*^20, "Kilograms"],
          "Radius" -> Quantity[252.3`4., "Kilometers"]], 
       "Tethys" -> Association[
        "Mass" -> Quantity[
          6.17452278924814959099`4.6989700043360205*^20, "Kilograms"],
          "Radius" -> Quantity[536.3`4., "Kilometers"]], 
       "Calypso" -> Association[
        "Mass" -> Quantity[
          3.595936591651433`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[9.5`2., "Kilometers"]], 
       "Telesto" -> Association[
        "Mass" -> Quantity[
          7.191873183302868`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[12.`2., "Kilometers"]], 
       "Polydeuces" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[1.2`2., "Kilometers"]], 
       "Dione" -> Association[
        "Mass" -> Quantity[
          1.095457133439213688532`4.6989700043360205*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[562.5`4., "Kilometers"]], 
       "Helene" -> Association[
        "Mass" -> Quantity[
          2.5471217524197656`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[16.`2., "Kilometers"]], 
       "Rhea" -> Association[
        "Mass" -> Quantity[
          2.308441461148901741032`4.6989700043360205*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[764.5`4., "Kilometers"]], 
       "Titan" -> Association[
        "Mass" -> Quantity[
          1.34520841449162446435527`4.958607314841778*^23, 
           "Kilograms"], 
         "Radius" -> Quantity[2575.5`5., "Kilometers"]], 
       "Hyperion" -> Association[
        "Mass" -> Quantity[
          5.543735578795960565`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[133.`4., "Kilometers"]], 
       "Iapetus" -> Association[
        "Mass" -> Quantity[
          1.805459830391657427108`4.6989700043360205*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[734.5`4., "Kilometers"]], 
       "Kiviuq" -> Association[
        "Mass" -> Quantity[
          3.296275209013815`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[8.`1., "Kilometers"]], 
       "Ijiraq" -> Association[
        "Mass" -> Quantity[
          1.198645530550478`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[6.`1., "Kilometers"]], 
       "Phoebe" -> Association[
        "Mass" -> Quantity[
          8.287135536843366995`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[106.6`4., "Kilometers"]], 
       "Paaliaq" -> Association[
        "Mass" -> Quantity[
          8.240688022534537`1.999565922520683*^15, "Kilograms"], 
         "Radius" -> Quantity[11.`3., "Kilometers"]], 
       "Skathi" -> Association[
        "Mass" -> Quantity[
          3.146444517695`1.9995659225206786*^14, "Kilograms"], 
         "Radius" -> Quantity[4.`1., "Kilometers"]], 
       "Albiorix" -> Association[
        "Mass" -> Quantity[
          2.0976296784633363`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[16.`2., "Kilometers"]], 
       "S/2007 S2" -> Association[
        "Mass" -> Quantity[1.5`2.*^14, "Kilograms"], 
         "Radius" -> Quantity[3.`1., "Kilometers"]], 
       "Bebhionn" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Erriapo" -> Association[
        "Mass" -> Quantity[
          7.64136525725929`1.9995659225206914*^14, "Kilograms"], 
         "Radius" -> Quantity[5.`1., "Kilometers"]], 
       "Siarnaq" -> Association[
        "Mass" -> Quantity[
          3.8955979742890535`1.999565922520683*^16, "Kilograms"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Skoll" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Tarvos" -> Association[
        "Mass" -> Quantity[
          2.696952443738576`1.9995659225206786*^15, "Kilograms"], 
         "Radius" -> Quantity[7.5`2., "Kilometers"]], 
       "Greip" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2004 S13" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Hyrrokkin" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[4.`2., "Kilometers"]], 
       "Mundilfari" -> Association[
        "Mass" -> Quantity[
          2.09762967846334`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "S/2006 S1" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Jarnsaxa" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Narvi" -> Association[
        "Mass" -> Quantity[
          3.44610590033262`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "Bergelmir" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2004 S17" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Suttungr" -> Association[
        "Mass" -> Quantity[
          2.09762967846334`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "Hati" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2004 S12" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Bestla" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Farbauti" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Thrymr" -> Association[
        "Mass" -> Quantity[
          2.09762967846334`1.9995659225206872*^14, "Kilograms"], 
         "Radius" -> Quantity[3.5`2., "Kilometers"]], 
       "S/2007 S3" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.5`2., "Kilometers"]], 
       "Aegir" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2004 S7" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "S/2006 S3" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Kari" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Fenrir" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[2.`2., "Kilometers"]], 
       "Surtur" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Ymir" -> Association[
        "Mass" -> Quantity[
          4.944412813520729`1.9995659225206872*^15, "Kilograms"], 
         "Radius" -> Quantity[9.`1., "Kilometers"]], 
       "Loge" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]], 
       "Fornjot" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[3.`2., "Kilometers"]]]], 
   "Uranus" -> Association[
    "Radius" -> Quantity[25266.`5., "Kilometers"], 
     "Moons" -> Association[
      "Cordelia" -> Association[
        "Mass" -> Quantity[
          4.4949207395642923`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[20.1`3., "Kilometers"]], 
       "Ophelia" -> Association[
        "Mass" -> Quantity[
          5.3939048874771508`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[21.4`3., "Kilometers"]], 
       "Bianca" -> Association[
        "Mass" -> Quantity[
          9.2895028617662042`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[25.7`3., "Kilometers"]], 
       "Cressida" -> Association[
        "Mass" -> Quantity[
          3.43112283120074311`2.9956786262173587*^17, "Kilograms"], 
         "Radius" -> Quantity[39.8`3., "Kilometers"]], 
       "Desdemona" -> Association[
        "Mass" -> Quantity[
          1.78298522669383596`2.995678626217367*^17, "Kilograms"], 
         "Radius" -> Quantity[32.`3., "Kilometers"]], 
       "Juliet" -> Association[
        "Mass" -> Quantity[
          5.57370171705972251`2.9956786262173543*^17, "Kilograms"], 
         "Radius" -> Quantity[46.8`3., "Kilometers"]], 
       "Portia" -> Association[
        "Mass" -> Quantity[
          1.681100356597045339`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[67.6`3., "Kilometers"]], 
       "Rosalind" -> Association[
        "Mass" -> Quantity[
          2.54712175241976567`2.9956786262173587*^17, "Kilograms"], 
         "Radius" -> Quantity[36.`2., "Kilometers"]], 
       "Cupid" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[5.`2., "Kilometers"]], 
       "Belinda" -> Association[
        "Mass" -> Quantity[
          3.56597045338767194`2.995678626217367*^17, "Kilograms"], 
         "Radius" -> Quantity[40.3`3., "Kilometers"]], 
       "Perdita" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Puck" -> Association[
        "Mass" -> Quantity[
          2.893230649366216176`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[81.`2., "Kilometers"]], 
       "Mab" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[5.`2., "Kilometers"]], 
       "Miranda" -> Association[
        "Mass" -> Quantity[
          6.5925504180276287794`1.9995659225206872*^19, "Kilograms"], 
         "Radius" -> Quantity[235.8`4., "Kilometers"]], 
       "Ariel" -> Association[
        "Mass" -> Quantity[
          1.352971142608851997243`2.9956786262173587*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[578.9`4., "Kilometers"]], 
       "Umbriel" -> Association[
        "Mass" -> Quantity[
          1.171676006113092205807`2.9956786262173587*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[584.7`4., "Kilometers"]], 
       "Titania" -> Association[
        "Mass" -> Quantity[
          3.525516166731593299572`3.9586073148417764*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[788.9`4., "Kilometers"]], 
       "Oberon" -> Association[
        "Mass" -> Quantity[
          3.013095202421263971712`3.9586073148417764*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[761.4`4., "Kilometers"]], 
       "Francisco" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[11.`2., "Kilometers"]], 
       "Caliban" -> Association[
        "Mass" -> Quantity[
          7.34170387462167751`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[49.`2., "Kilometers"]], 
       "Stephano" -> Association[
        "Mass" -> Quantity[
          5.99322765275239`0.9999565727231373*^15, "Kilograms"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Trinculo" -> Association[
        "Mass" -> Quantity[
          7.49153456594048`0.9999565727231373*^14, "Kilograms"], 
         "Radius" -> Quantity[5.`1., "Kilometers"]], 
       "Sycorax" -> Association[
        "Mass" -> Quantity[
          5.378921818345269844`2.9956786262173627*^18, "Kilograms"], 
         "Radius" -> Quantity[95.`2., "Kilometers"]], 
       "Margaret" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Prospero" -> Association[
        "Mass" -> Quantity[
          2.0976296784633363`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[15.`2., "Kilometers"]], 
       "Setebos" -> Association[
        "Mass" -> Quantity[
          2.0976296784633363`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[15.`2., "Kilometers"]], 
       "Ferdinand" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]]]], 
   "Neptune" -> Association[
    "Radius" -> Quantity[24552.5`5., "Kilometers"], 
     "Moons" -> Association[
      "Naiad" -> Association[
        "Mass" -> Quantity[
          1.94779898714452669`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[33.`2., "Kilometers"]], 
       "Thalassa" -> Association[
        "Mass" -> Quantity[
          3.74576728297024363`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[41.`2., "Kilometers"]], 
       "Despina" -> Association[
        "Mass" -> Quantity[
          2.09762967846333643`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[75.`2., "Kilometers"]], 
       "Galatea" -> Association[
        "Mass" -> Quantity[
          3.745767282970243625`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[88.`2., "Kilometers"]], 
       "Larissa" -> Association[
        "Mass" -> Quantity[
          4.944412813520721585`1.999565922520683*^18, "Kilograms"], 
         "Radius" -> Quantity[97.`2., "Kilometers"]], 
       "Proteus" -> Association[
        "Mass" -> Quantity[
          5.0343112283120074311`2.995678626217367*^19, "Kilograms"], 
         "Radius" -> Quantity[210.`3., "Kilometers"]], 
       "Triton" -> Association[
        "Mass" -> Quantity[
          2.139432441341284348686`4.6989700043360205*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1353.4`5., "Kilometers"]], 
       "Nereid" -> Association[
        "Mass" -> Quantity[
          3.0865122411674807466`2.9956786262173587*^19, "Kilograms"], 
         "Radius" -> Quantity[170.`3., "Kilometers"]], 
       "Halimede" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[30.`2., "Kilometers"]], 
       "Sao" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Laomedeia" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Psamathe" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Neso" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[30.`2., "Kilometers"]]]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"Radius", "Moons"}, {
TypeSystem`Atom[
Quantity[1, "Kilometers"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"Mass", "Radius"}, {
TypeSystem`Atom[
Quantity[1, "Kilograms"]], 
TypeSystem`Atom[
Quantity[1, "Kilometers"]]}], TypeSystem`AnyLength]}], 8], 
Association["ID" -> 165317787556689]], 
 DatasetDisplayPanel -> {"Earth"}]

ScrollPosition

When a Dataset has scrollbars, you can specify the initial scroll positions with ScrollPosition, giving the initial vertical and horizontal positions:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Mercury" -> Association[
    "Radius" -> Quantity[2439.7`5., "Kilometers"], 
     "Moons" -> Association[]], 
   "Venus" -> Association[
    "Radius" -> Quantity[6051.85`5., "Kilometers"], 
     "Moons" -> Association[]], 
   "Earth" -> Association[
    "Radius" -> Quantity[
      6367.4446571000000000001`8.299868708313456, "Kilometers"], 
     "Moons" -> Association[
      "Moon" -> Association[
        "Mass" -> Quantity[
          7.3459006322855173653772`4.995678626217362*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1737.5`5., "Kilometers"]]]], 
   "Mars" -> Association[
    "Radius" -> Quantity[3385.595`4.298042852900571, "Kilometers"], 
     "Moons" -> Association[
      "Phobos" -> Association[
        "Mass" -> Quantity[
          1.0724880884600402`3.9586073148417724*^16, "Kilograms"], 
         "Radius" -> Quantity[11.1`3., "Kilometers"]], 
       "Deimos" -> Association[
        "Mass" -> Quantity[
          1.468340774924336`1.9995659225206786*^15, "Kilograms"], 
         "Radius" -> Quantity[6.2`2., "Kilometers"]]]], 
   "Jupiter" -> Association[
    "Radius" -> Quantity[69173.`5., "Kilometers"], 
     "Moons" -> Association[
      "Metis" -> Association[
        "Mass" -> Quantity[
          1.19864553055047796`0.9999565727231415*^17, "Kilograms"], 
         "Radius" -> Quantity[21.5`3., "Kilometers"]], 
       "Adrastea" -> Association[
        "Mass" -> Quantity[
          7.491534565940487`0.9999565727231415*^15, "Kilograms"], 
         "Radius" -> Quantity[8.2`2., "Kilometers"]], 
       "Amalthea" -> Association[
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       "Perdita" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Puck" -> Association[
        "Mass" -> Quantity[
          2.893230649366216176`3.9586073148417764*^18, "Kilograms"], 
         "Radius" -> Quantity[81.`2., "Kilometers"]], 
       "Mab" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[5.`2., "Kilometers"]], 
       "Miranda" -> Association[
        "Mass" -> Quantity[
          6.5925504180276287794`1.9995659225206872*^19, "Kilograms"], 
         "Radius" -> Quantity[235.8`4., "Kilometers"]], 
       "Ariel" -> Association[
        "Mass" -> Quantity[
          1.352971142608851997243`2.9956786262173587*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[578.9`4., "Kilometers"]], 
       "Umbriel" -> Association[
        "Mass" -> Quantity[
          1.171676006113092205807`2.9956786262173587*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[584.7`4., "Kilometers"]], 
       "Titania" -> Association[
        "Mass" -> Quantity[
          3.525516166731593299572`3.9586073148417764*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[788.9`4., "Kilometers"]], 
       "Oberon" -> Association[
        "Mass" -> Quantity[
          3.013095202421263971712`3.9586073148417764*^21, 
           "Kilograms"], 
         "Radius" -> Quantity[761.4`4., "Kilometers"]], 
       "Francisco" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[11.`2., "Kilometers"]], 
       "Caliban" -> Association[
        "Mass" -> Quantity[
          7.34170387462167751`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[49.`2., "Kilometers"]], 
       "Stephano" -> Association[
        "Mass" -> Quantity[
          5.99322765275239`0.9999565727231373*^15, "Kilograms"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Trinculo" -> Association[
        "Mass" -> Quantity[
          7.49153456594048`0.9999565727231373*^14, "Kilograms"], 
         "Radius" -> Quantity[5.`1., "Kilometers"]], 
       "Sycorax" -> Association[
        "Mass" -> Quantity[
          5.378921818345269844`2.9956786262173627*^18, "Kilograms"], 
         "Radius" -> Quantity[95.`2., "Kilometers"]], 
       "Margaret" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]], 
       "Prospero" -> Association[
        "Mass" -> Quantity[
          2.0976296784633363`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[15.`2., "Kilometers"]], 
       "Setebos" -> Association[
        "Mass" -> Quantity[
          2.0976296784633363`1.9995659225206872*^16, "Kilograms"], 
         "Radius" -> Quantity[15.`2., "Kilometers"]], 
       "Ferdinand" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[10.`2., "Kilometers"]]]], 
   "Neptune" -> Association[
    "Radius" -> Quantity[24552.5`5., "Kilometers"], 
     "Moons" -> Association[
      "Naiad" -> Association[
        "Mass" -> Quantity[
          1.94779898714452669`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[33.`2., "Kilometers"]], 
       "Thalassa" -> Association[
        "Mass" -> Quantity[
          3.74576728297024363`1.9995659225206872*^17, "Kilograms"], 
         "Radius" -> Quantity[41.`2., "Kilometers"]], 
       "Despina" -> Association[
        "Mass" -> Quantity[
          2.09762967846333643`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[75.`2., "Kilometers"]], 
       "Galatea" -> Association[
        "Mass" -> Quantity[
          3.745767282970243625`1.9995659225206872*^18, "Kilograms"], 
         "Radius" -> Quantity[88.`2., "Kilometers"]], 
       "Larissa" -> Association[
        "Mass" -> Quantity[
          4.944412813520721585`1.999565922520683*^18, "Kilograms"], 
         "Radius" -> Quantity[97.`2., "Kilometers"]], 
       "Proteus" -> Association[
        "Mass" -> Quantity[
          5.0343112283120074311`2.995678626217367*^19, "Kilograms"], 
         "Radius" -> Quantity[210.`3., "Kilometers"]], 
       "Triton" -> Association[
        "Mass" -> Quantity[
          2.139432441341284348686`4.6989700043360205*^22, 
           "Kilograms"], 
         "Radius" -> Quantity[1353.4`5., "Kilometers"]], 
       "Nereid" -> Association[
        "Mass" -> Quantity[
          3.0865122411674807466`2.9956786262173587*^19, "Kilograms"], 
         "Radius" -> Quantity[170.`3., "Kilometers"]], 
       "Halimede" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[30.`2., "Kilometers"]], 
       "Sao" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Laomedeia" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Psamathe" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[20.`2., "Kilometers"]], 
       "Neso" -> Association[
        "Mass" -> Missing["NotAvailable"], 
         "Radius" -> Quantity[30.`2., "Kilometers"]]]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"Radius", "Moons"}, {
TypeSystem`Atom[
Quantity[1, "Kilometers"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"Mass", "Radius"}, {
TypeSystem`Atom[
Quantity[1, "Kilograms"]], 
TypeSystem`Atom[
Quantity[1, "Kilometers"]]}], TypeSystem`AnyLength]}], 8], 
Association["ID" -> 165317787556689]], MaxItems -> {3, 1}, 
 ScrollPosition -> {2, 2}]

Deep Dive into Options Syntax

Dataset’s styling options have a rich syntax that supports patterns, cyclic specifications and value functions. To show you how those work, I’ll take a deep dive into Background syntax. Other styling options work similarly.

To apply the same Background color to all items in a Dataset, specify a single color:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> Yellow]

To specify different colors for successive levels of a Dataset, give a list:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {Yellow, Cyan}]

But wait, that colored everything green! That’s because the yellow rows and cyan columns blend to give green items. You can see what’s going on more clearly in the next example.

Giving a list at a given level applies the colors to successive elements. In this case, the first row is yellow, the second is cyan and the rest are the default color:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {{Yellow, Cyan}}]

If you color the columns similarly, the colors blend at their intersections. Thus the {"Eva","age"} and {"Deb","sex"} items are green, the blend of yellow and cyan:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {{Yellow, Cyan}, {Yellow, Cyan}}]

As in Grid, you can specify background colors to be used at the beginning, middle and end at a given level. This example makes the first row red, the second orange, then rows cyclically yellow and white until the last row, which is again red:

Dataset
&#10005

Dataset[IdentityMatrix[8], 
 Background -> {{Red, Orange, {Yellow, White}, Red}}]

Background colors blend (as they do in Grid) in order to support this kind of styling, which makes it easier to follow long rows and columns:

Dataset
&#10005

Dataset[IdentityMatrix[8], 
 Background -> {{{LightBlue, White}}, {{LightGreen, White}}}]

In options other than Background, values do not blend. Instead, later values override earlier ones. And within a Background option value, colors only blend when they are part of the same specification. In this example, the column colors override the row colors, except where the column color is None, which lets the row color show through:

Dataset
&#10005

Dataset[IdentityMatrix[8], 
 Background -> {{All} -> {{{LightBlue, White}}}, {All, 
     All} -> {None, {{LightGreen, None}}}}]

You can specify values at arbitrary levels. To use the default coloring at a given level, specify Automatic. In this example, items in the “children” column, which are at the third level of the Dataset, are colored yellow and orange, while items at higher levels have default coloring:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {Automatic, Automatic, {Yellow, Orange}}]

When you hover over a Dataset element, you’ll see its path displayed below the dataset frame. To apply a background color to that element, specify that path on the left-hand side of a rule in the Background value:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {{All, "sex"} -> Cyan}]

If you give a non-list element instead of a path on the left-hand side of a rule, the value is applied to any path that contains that element:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {"sex" -> Cyan}]

Combine level syntax and path syntax to specify a general rule and exceptions, as here where all rows are colored yellow, with the exception of the “Eva” row, which is colored cyan:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {Yellow, {"Eva"} -> Cyan}]

Element paths can contain arbitrary patterns. Here, both the “Eva” and “Ann” rows are colored cyan:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {{"Eva" | "Ann"} -> Cyan}]

Patterns can be arbitrarily complex. This colors any row cyan whose header contains a lowercase or uppercase a:

Dataset
&#10005

Dataset[Dataset[
Association[
  "Deb" -> Association[
    "age" -> 62, "sex" -> "female", 
     "children" -> Association[
      "Hal" -> Association["age" -> 29, "sex" -> "male"], 
       "Kat" -> Association["age" -> 31, "sex" -> "female"]]], 
   "Eva" -> Association[
    "age" -> 43, "sex" -> "female", "children" -> Association[]], 
   "Bob" -> Association[
    "age" -> 41, "sex" -> "male", 
     "children" -> Association[
      "Bob" -> Association["age" -> 1, "sex" -> "male"], 
       "Bri" -> Association["age" -> 3, "sex" -> "female"], 
       "Dan" -> Association["age" -> 6, "sex" -> "male"]]], 
   "Ann" -> Association[
    "age" -> 35, "sex" -> "female", 
     "children" -> Association[
      "Amy" -> Association["age" -> 6, "sex" -> "female"]]], 
   "Cal" -> Association[
    "age" -> 60, "sex" -> "female", "children" -> Association[]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex", "children"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"age", "sex"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[String]}], TypeSystem`AnyLength]}], 5], 
Association["ID" -> 165274837883637, MaxItems -> {All, All, All}]], 
 Background -> {{_?(! StringFreeQ[#, "a" | "A"] &)} -> Cyan}]

The restriction imposed by a path is applied after coloring is applied to the Dataset as a whole. Compare these examples. In the first, top-level rows are colored yellow, white and cyan:

Dataset
&#10005

Dataset[Dataset[
Association[
  "a" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "x" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]], 
   "b" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "y" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]], 
   "c" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "z" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"1", "2", "3"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[Integer], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Assoc[
TypeSystem`Atom[
TypeSystem`Enumeration["a", "b", "c"]], 
TypeSystem`Atom[Integer], 3], 1]}], 3], 
Association["ID" -> 165433751674104]], 
 Background -> {{Yellow, White, Cyan}}]

Adding a path specification restricts the coloring to the “3” column:

Dataset
&#10005

Dataset[Dataset[
Association[
  "a" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "x" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]], 
   "b" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "y" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]], 
   "c" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "z" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"1", "2", "3"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[Integer], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Assoc[
TypeSystem`Atom[
TypeSystem`Enumeration["a", "b", "c"]], 
TypeSystem`Atom[Integer], 3], 1]}], 3], 
Association["ID" -> 165433751674104]], 
 Background -> {{All, "3"} -> {{Yellow, White, Cyan}}}]

To apply the yellow-white-cyan coloring to the individual rows in the {All, "3"} column, specify the coloring at the level of those items, the fourth:

Dataset
&#10005

Dataset[Dataset[
Association[
  "a" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "x" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]], 
   "b" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "y" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]], 
   "c" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "z" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"1", "2", "3"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[Integer], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Assoc[
TypeSystem`Atom[
TypeSystem`Enumeration["a", "b", "c"]], 
TypeSystem`Atom[Integer], 3], 1]}], 3], 
Association["ID" -> 165433751674104]], 
 Background -> {{All, "3"} -> {None, None, 
     None, {Yellow, White, Cyan}}}]

Since nothing outside of the “3” column is colored in the previous example, the path restriction is redundant. This is another way of specifying the same thing:

Dataset
&#10005

Dataset[Dataset[
Association[
  "a" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "x" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]], 
   "b" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "y" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]], 
   "c" -> Association[
    "1" -> 1, "2" -> 2, 
     "3" -> Association[
      "z" -> Association["a" -> 1, "b" -> 2, "c" -> 3]]]], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Struct[{"1", "2", "3"}, {
TypeSystem`Atom[Integer], 
TypeSystem`Atom[Integer], 
TypeSystem`Assoc[
TypeSystem`Atom[String], 
TypeSystem`Assoc[
TypeSystem`Atom[
TypeSystem`Enumeration["a", "b", "c"]], 
TypeSystem`Atom[Integer], 3], 1]}], 3], 
Association["ID" -> 165433751674104]], 
 Background -> {None, None, None, {Yellow, White, Cyan}}]

The value of any specification within a styling option can be a function that returns a value. That gives you a useful way of highlighting patterns in data. Here, for example, are the first 100 positive integers, with prime numbers highlighted yellow:

Dataset
&#10005

Dataset[Range[100], Background -> (If[PrimeQ[#], Yellow, White] &)]

The arguments of a value function are the value of the item or header, its path within the dataset and the entire dataset itself. Having the dataset available as an argument makes it possible to do local styling based on global properties, as in this example, where rows are colored according to sex. The color of each item is obtained by looking at the value of the “sex” entry in the row that contains the item:

Dataset
&#10005

Dataset[ExampleData[{"Dataset", "Titanic"}], 
 Background -> (If[#3[#2[[1]], "sex"] === "male", LightBlue, 
     LightRed] &)]

Putting It All Together

The new Dataset options are intended to help you gain insight into your data and present it effectively. Next are some examples of how you might use them to do so.

This is a sample of the built-in Titanic dataset:

Dataset
&#10005

Dataset[{
Association[
  "class" -> "1st", "age" -> 47, "sex" -> "male", 
   "survived" -> False], 
Association[
  "class" -> "3rd", "age" -> 32, "sex" -> "male", 
   "survived" -> False], 
Association[
  "class" -> "1st", "age" -> 54, "sex" -> "female", 
   "survived" -> True], 
Association[
  "class" -> "2nd", "age" -> 24, "sex" -> "male", 
   "survived" -> False], 
Association[
  "class" -> "2nd", "age" -> 29, "sex" -> "male", 
   "survived" -> False], 
Association[
  "class" -> "1st", "age" -> 55, "sex" -> "male", 
   "survived" -> False], 
Association[
  "class" -> "1st", "age" -> 24, "sex" -> "female", 
   "survived" -> True], 
Association[
  "class" -> "1st", "age" -> 25, "sex" -> "male", 
   "survived" -> True]}, 
TypeSystem`Vector[
TypeSystem`Struct[{"class", "age", "sex", "survived"}, {
TypeSystem`Atom[
TypeSystem`Enumeration["1st", "2nd", "3rd"]], 
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Atom[TypeSystem`Boolean]}], 8], 
Association["ID" -> 200390490496301]]

Styling with ItemDisplayFunction and color backgrounds makes the data more immediately comprehensible:

Datasetalt
&#10005

Dataset[Dataset[{
Association[
   "class" -> "1st", "age" -> 47, "sex" -> "male", 
    "survived" -> False], 
Association[
   "class" -> "3rd", "age" -> 32, "sex" -> "male", 
    "survived" -> False], 
Association[
   "class" -> "1st", "age" -> 54, "sex" -> "female", 
    "survived" -> True], 
Association[
   "class" -> "2nd", "age" -> 24, "sex" -> "male", 
    "survived" -> False], 
Association[
   "class" -> "2nd", "age" -> 29, "sex" -> "male", 
    "survived" -> False], 
Association[
   "class" -> "1st", "age" -> 55, "sex" -> "male", 
    "survived" -> False], 
Association[
   "class" -> "1st", "age" -> 24, "sex" -> "female", 
    "survived" -> True], 
Association[
   "class" -> "1st", "age" -> 25, "sex" -> "male", 
    "survived" -> True]}, 
TypeSystem`Vector[
TypeSystem`Struct[{"class", "age", "sex", "survived"}, {
TypeSystem`Atom[
TypeSystem`Enumeration["1st", "2nd", "3rd"]], 
TypeSystem`Atom[Integer], 
TypeSystem`Atom[
TypeSystem`Enumeration["female", "male"]], 
TypeSystem`Atom[TypeSystem`Boolean]}], 8], 
Association["ID" -> 200390490496301]],
 ItemDisplayFunction -> {
   "class" -> (StringTake[#, 1] &),
   "age" -> (Tooltip[
       Style[Spacer[{2 #, 20}], 
        Background -> GrayLevel[0.75]], #] &),
   "sex" -> (If[# === "male", \[Mars], \[Venus]] &),
   "survived" -> (If[#, "\[Checkmark]", ""] &)},
 Background -> (Switch[#3[[#2[[1]], "class"]], "1st", RGBColor[
     0.96, 0.96, 1.], "2nd", RGBColor[1., 0.96, 0.96], "3rd", 
     RGBColor[1., 1., 0.96]] &)]

Since styling options don’t affect the contents of datasets, you can use them to present numeric data in whatever formats make sense without compromising the original data:

Dataset
&#10005

Dataset[{
Association[
  "weight" -> 19.016849999999998`, "factor" -> 0.8957944119265218, 
   "yield" -> 0.3234856056220916], 
Association[
  "weight" -> 23.73867, "factor" -> 0.15031445199065052`, 
   "yield" -> 0.4385543939388503], 
Association[
  "weight" -> 5.78343, "factor" -> 0.19464352143691332`, 
   "yield" -> 0.7559025964339601], 
Association[
  "weight" -> 21.92067, "factor" -> 0.9981134853066305, 
   "yield" -> 0.3376021923291914], 
Association[
  "weight" -> 22.83753, "factor" -> 0.8753398388191531, 
   "yield" -> 0.40843903121632064`], 
Association[
  "weight" -> 4.81656, "factor" -> 0.5974688040388945, 
   "yield" -> 0.6662428187598886]}, ItemDisplayFunction -> {
   "weight" -> (Quantity[#, "kg"] &),
   "factor" -> (NumberForm[#, {2, 2}] &),
   "yield" -> (PercentForm[#, 2] &)
   }, Alignment -> Center, HeaderAlignment -> Center]

Use coloring to make it easier to pick out significant values in data. Here, negative numbers are colored red, and the largest and smallest values in each column are highlighted in blue and pink, respectively:

Dataset
&#10005

Dataset[Table[RandomReal[{-1, 1}], {7}, {3}],
 ItemStyle -> (If[# < 0, Red, Black] &),
 Background -> (Switch[#, Max[#3[[All, #2[[2]]]]], LightBlue, 
     Min[#3[[All, #2[[2]]]]], LightRed, _, White] &)]

Heat maps are particularly easy using a background color function:

Dataset
&#10005

Dataset[CompressedData["
1:eJwBmQFm/iFib1JlAgAAAAcAAAAHAAAAqB8MAQ4o6j8gE/Hh/oW8P5xqyQTM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"], Background -> (Hue[1, #] &)]

For a more compact presentation, hide the data behind Tooltip. Hovering over an item shows its value:

Datasetalt
&#10005

Dataset[CompressedData["
1:eJwBmQFm/iFib1JlAgAAAAcAAAAHAAAAqB8MAQ4o6j8gE/Hh/oW8P5xqyQTM
Q+k/WBmY+u4JyD/IeeGK6uTOP5B5K15B1LA/TJKulRVa4T9Ai2CLeJbNP6wr
UeQpWNk/ULck/kdq5j84hj0aHR3LP6SgvEb/9Oc/+HmAK/wP2z/I7N6y6K3P
P/gK6Lb9RO8/PC7fG7xn6j/+nRu92pvtP6oogp1vf+I/zEBitWC+0j9AuJDT
aqHKP25FKjg/k+I/sGLoezN9wD/gP/aVgZzTP7ylaonNyOY/tDn/Gkv/2D8s
FTnuKz3qP2AK5haP0tQ/Yjtl3/z74j8ATy5IzJngPyBLC/I3osU/YIfQ3oE+
3j+wwNnjQtTpP4AhN+0wPYg/rK2DmLJH1D80czYYE0bpP4Cferrsh4g/0Lmu
IKwK2T/sdOE7p17dPzgmju22Xd0/cB9pSNFH5z+2bHmnUUzpP+BKX5lm2dA/
fKSDbHkK0z8ga+3Vo2jcP6AD84+yUaw/nPF1oRDS3j8ESZVCIKDnP2CxYKxH
/Mk/4ueRPcVu4T/3xctC
"], ItemDisplayFunction -> {Tooltip["  ", #] &}, 
 Background -> (Hue[1, #] &), ItemSize -> 2]

Version 12.1 gives Dataset a big boost in functionality, but we’re not done yet. There’s more to come in future versions. If you have specific requests, leave me a note in the comments section.

Get full access to the latest Wolfram Language functionality with a Mathematica 12.1 or Wolfram|One trial.
Christopher Carlson, Senior User Interface Developer, User Interfaces

Comments

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4 comments

  1. It would be useful to have a `DatasetForm` function that has all the fancy display and drilldown functionality `Dataset` has, without the data-handling facilities (like type-recognition, query-support, etc.). This would effectively separate dataset front-end from back-end, alleviating displaying data. I must assume that actually something similar happens under the hood.

    Reply
    István Zachar
    June 23, 2020 at 3:27 pm 06/23/2020 at 3:27 pm

  2. The MaxItems does not seem to work properly. I have a data in tabular form (list of simple associations) with 43 columns. There is no way to display all columns at once without the scroll bar as it used to be in the previous version. Also, when I have some Dataset – how do I change its options? By wrapping it in a Dataset again?

    In future versions, I would like to see improved memory efficiency. At least for datasets in tabular form. Currently, importing a simple CSV file with a lot of rows takes insane amount of RAM.

    Furthermore, Dataset does not hold the options if you perform more calculations on it. I tried to use PercentForm in the ItemDisplayFunction, but when I further do a Select on the Dataset, it no longer uses the ItemDisplayFunction :(

    Reply
    Jan
    June 25, 2020 at 3:48 am 06/25/2020 at 3:48 am

    • Is it possible that your Dataset has more than two levels? In that case, the columns may correspond to a deeper level than 2. For example, here the rows are at level 3 in the data, and so putting All at level 2 in MaxItems doesn’t change the column limit:

      Dataset[Table[{Association[Table[ToString[i] -> 0, {i, 20}]]}, 3], MaxItems -> {Automatic, All}]

      Putting All at level 3 is what is needed here:

      Dataset[Table[{Association[Table[ToString[i] -> 0, {i, 20}]]}, 3], MaxItems -> {Automatic, Automatic, All}]

      To change a Dataset’s options, yes, wrap it with Dataset and the new options (the same way Image works):

      ds = Dataset[{Range[10]}];
      Dataset[ds, MaxItems -> {All, 5}]

      Reply
      Christopher Carlson
      June 25, 2020 at 11:06 am 06/25/2020 at 11:06 am

  3. There are two things that would make Dataset useful (not more useful, but useful):

    1) Much of my work is in data analysis, and most of the data that I work with have each column representing a variable, and each row representing a record. Thus, columns have names. Most data analysts use data like this.
    If I use a Dataset for this type of data then it uses a huge amount of memory – because it stores the column title for EACH value. Since I work with large data sets, using Dataset is not feasible because of the memory problem. On the other hand, if, instead, each row has a name, then Dataset doesn’t have this memory problem – because it stores the row titles only once. My suggestion is that, for Datasets which have the same column title for all rows, you store the column title only once.

    2) Make Dataset as easy to use as arrays – i.e. we can currently access items within a Dataset by
    dataset[[]]
    Allow us to also assign values by dataset[[]].
    I suspect this was originally planned, since when Dataset was first introduced the helpfiles said that you could do it, but this disappeared from the helpfiles.

    Reply
    Vilis Nams
    July 17, 2020 at 8:06 am 07/17/2020 at 8:06 am