ALTER FUNCTION - change the definition of a function
ALTER FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] ) action [, ... ] [ RESTRICT ] ALTER FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] ) RENAME TO new_name ALTER FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] ) OWNER TO new_owner ALTER FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] ) SET SCHEMA new_schema where action is one of: CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT IMMUTABLE | STABLE | VOLATILE [ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER
ALTER FUNCTION changes the definition of a function.
You must own the function to use ALTER FUNCTION. To change a function's schema, you must also have CREATE privilege on the new schema. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the function's schema. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the function. However, a superuser can alter ownership of any function anyway.)
To rename the function sqrt for type integer to square_root:
ALTER FUNCTION sqrt(integer) RENAME TO square_root;
To change the owner of the function sqrt for type integer to joe:
ALTER FUNCTION sqrt(integer) OWNER TO joe;
To change the schema of the function sqrt for type integer to maths:
ALTER FUNCTION sqrt(integer) SET SCHEMA maths;
This statement is partially compatible with the ALTER FUNCTION statement in the SQL standard. The standard allows more properties of a function to be modified, but does not provide the ability to rename a function, make a function a security definer, or change the owner, schema, or volatility of a function. The standard also requires the RESTRICT key word, which is optional in PostgreSQL.
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Created 1996-2023 by Maxim Chirkov
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