DROP 
LANGUAGE(7) SQL Commands DROP LANGUAGE(7) NAME
DROP LANGUAGE - remove a procedural language SYNOPSIS
DROP [ PROCEDURAL ] LANGUAGE [ IF EXISTS ] name [ CASCADE | RESTRICT ] DESCRIPTION
DROP LANGUAGE removes the definition of a previously registered procedural language. You must be a superuser or the owner of the language to use DROP LANGUAGE. PARAMETERS
IF EXISTS Do not throw an error if the language does not exist. A notice is issued in this case. name The name of an existing procedural language. For backward compatibility, the name can be enclosed by single quotes. CASCADE Automatically drop objects that depend on the language (such as functions in the language). RESTRICT Refuse to drop the language if any objects depend on it. This is the default. EXAMPLES
This command removes the procedural language plsample: DROP LANGUAGE plsample; COMPATIBILITY
There is no DROP LANGUAGE statement in the SQL standard. SEE ALSO
ALTER LANGUAGE [alter_language(7)], CREATE LANGUAGE [create_language(7)], droplang(1) SQL - Language Statements 2010-05-14 DROP LANGUAGE(7)