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SQL Reference
Changes the definition of a procedural language.
ALTER [ PROCEDURAL ] LANGUAGE <name> RENAME TO <new_name>
ALTER [ PROCEDURAL ] LANGUAGE <name> OWNER TO { <new_owner> | CURRENT_USER | SESSION_USER }
ALTER LANGUAGE changes the definition of a procedural language for a specific database. Definition changes supported include renaming the language or assigning a new owner. You must be superuser or the owner of the language to use ALTER LANGUAGE.
There is no ALTER LANGUAGE
statement in the SQL standard.