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

[discrete]
[[esql-to_lower]]
=== `TO_LOWER`

*Syntax*

[.text-center]
image::esql/functions/signature/to_lower.svg[Embedded,opts=inline]

*Parameters*

`str`::
String expression. If `null`, the function returns `null`.

*Description*

Returns a new string representing the input string converted to lower case.

include::types/to_lower.asciidoc[]

*Example*

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