ALTER FUNCTION SQL - Language Statements ALTER FUNCTION change the definition of a function ALTER FUNCTION ALTER FUNCTION name ( [ type [, ...] ] ) RENAME TO newname ALTER FUNCTION name ( [ type [, ...] ] ) OWNER TO newowner ALTER FUNCTION changes the definition of a function. name The name (optionally schema-qualified) of an existing function. type The data type of an argument of the function. newname The new name of the function. newowner The new owner of the function. To change the owner of a function, you must be a superuser. Note that if the function is marked SECURITY DEFINER, it will subsequently execute as the new owner. 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; There is an ALTER FUNCTION statement in the SQL standard, but it does not provide the option to rename the function or change the owner.