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

[[esql-case]]
=== `CASE`

Accepts pairs of conditions and values. The function returns the value that
belongs to the first condition that evaluates to `true`. If the number of
arguments is odd, the last argument is the default value which is returned when
no condition matches.

[source,esql]
----
FROM employees
| EVAL type = CASE(
    languages <= 1, "monolingual",
    languages <= 2, "bilingual",
     "polyglot")
| PROJECT first_name, last_name, type
----