findfirstif

The findfirstif aggregation function returns the first observed non-null value of Expression across the group for which Predicate evaluates to true.

Use this function with the summarize, eventstats, and timestats operators.

Syntax

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    findfirstif( Expression, Predicate )

Arguments

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• Expression: Expression used for aggregation calculation. Wildcards are not supported for field names.
• Predicate: Expression that will be used to filter rows.

Usage

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To find an earliest event with respect to the _time field, instead use findearliestif.

You can use findfirstif after a sort or order operator when sorting by a non-time field. Once events are sorted, this function acts much like minif.

Example

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This example returns the birthday for all names that have more than 4 letters.

dataset=myDataset
| summarize findfirstif(day_of_birth, strlen(name) > 4)