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preview plugin

Applies to: ✅ Microsoft FabricAzure Data Explorer

Returns a table with up to the specified number of rows from the input record set, and the total number of records in the input record set.

Syntax

T | evaluate preview(NumberOfRows)

Learn more about syntax conventions.

Parameters

Name Type Required Description
T string ✔️ The table to preview.
NumberOfRows int ✔️ The number of rows to preview from the table.

Returns

The preview plugin returns two result tables:

  • A table with up to the specified number of rows. For example, the sample query above is equivalent to running T | take 50.
  • A table with a single row/column, holding the number of records in the input record set. For example, the sample query above is equivalent to running T | count.

Note

  • Using additional operators after the preview plugin results in a query failure. The preview plugin should be the last operator of the query because it returns two result tables.

Example

StormEvents | evaluate preview(5)

Table1

The following output table only includes the first 6 columns. To see the full result, run the query.

StartTime EndTime EpisodeId EventId State EventType ...
2007-12-30T16:00:00Z 2007-12-30T16:05:00Z 11749 64588 GEORGIA Thunderstorm Wind ...
2007-12-20T07:50:00Z 2007-12-20T07:53:00Z 12554 68796 MISSISSIPPI Thunderstorm Wind ...
2007-09-29T08:11:00Z 2007-09-29T08:11:00Z 11091 61032 ATLANTIC SOUTH Waterspout ...
2007-09-20T21:57:00Z 2007-09-20T22:05:00Z 11078 60913 FLORIDA Tornado ...
2007-09-18T20:00:00Z 2007-09-19T18:00:00Z 11074 60904 FLORIDA Heavy Rain ...

Table2

Count
59066