[discrete]
[[esql-to_boolean]]
=== `TO_BOOLEAN`

*Alias*

`TO_BOOL`

*Syntax*

[source,esql]
----
TO_BOOLEAN(v)
----

*Parameters*

`v`::
Input value. The input can be a single- or multi-valued column or an expression.

*Description*

Converts an input value to a boolean value.

A string value of *"true"* will be case-insensitive converted to the Boolean
*true*. For anything else, including the empty string, the function will
return *false*.

The numerical value of *0* will be converted to *false*, anything else will be
converted to *true*.

*Supported types*

The input type must be of a string or numeric type.

*Example*

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