Collation Version Function

pg_collation_actual_version (oid)

Description: Returns the actual version of the collation object currently installed in the operating system. Currently, this parameter is valid only for case_insensitive collations.

Return type: text

Example:

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SELECT oid FROM pg_collation WHERE collname ='case_insensitive';
 oid
------
 3300
(1 row)

SELECT pg_collation_actual_version(3300);
 pg_collation_actual_version
-----------------------------
 153.14
(1 row)