Functions / String Functions And Operators

casefold

Performs case folding of the input string according to the collation.

Reading PG 18current·documented in 3 of 27 versions, 18 to 20

7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4 9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19 20

Signatures & examples

casefold ( text ) → text

Performs case folding of the input string according to the collation. Case folding is similar to case conversion, but the purpose of case folding is to facilitate case-insensitive matching of strings, whereas the purpose of case conversion is to convert to a particular cased form. This function can only be used when the server encoding is UTF8.

Version history 1

17 → 18 added

Definition snapshot: 2026-09-14T13:14:25.684213+00:00@99e6866c · English manual source