elasticsearch/docs/reference/esql/functions/greatest.asciidoc

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[discrete]
[[esql-greatest]]
=== `GREATEST`
*Syntax*
[.text-center]
image::esql/functions/signature/greatest.svg[Embedded,opts=inline]
*Parameters*
`first`::
First of the columns to evaluate.
`rest`::
The rest of the columns to evaluate.
*Description*
Returns the maximum value from multiple columns. This is similar to <<esql-mv_max>>
except it is intended to run on multiple columns at once.
NOTE: When run on `keyword` or `text` fields, this returns the last string
in alphabetical order. When run on `boolean` columns this will return
`true` if any values are `true`.
include::types/greatest.asciidoc[]
*Example*
[source.merge.styled,esql]
----
include::{esql-specs}/math.csv-spec[tag=greatest]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/math.csv-spec[tag=greatest-result]
|===