[discrete]
[[esql-coalesce]]
=== `COALESCE`

*Syntax*

[source,esql]
----
COALESCE(expression1 [, ..., expressionN])
----

*Parameters*

`expressionX`::
Expression to evaluate.

*Description*

Returns the first of its arguments that is not null. If all arguments are null,
it returns `null`.

*Example*

[source.merge.styled,esql]
----
include::{esql-specs}/null.csv-spec[tag=coalesce]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/null.csv-spec[tag=coalesce-result]
|===