DROP FUNCTION SQL - Language Statements DROP FUNCTION remove a user-defined function 1999-07-20 DROP FUNCTION name ( [ type [, ...] ] ) [ CASCADE | RESTRICT ] 1998-04-15 name The name (optionally schema-qualified) of an existing function. type The type of a parameter of the function. CASCADE Automatically drop objects that depend on the function (such as operators or triggers). RESTRICT Refuse to drop the function if there are any dependent objects. This is the default. 1998-04-15 DROP FUNCTION Message returned if the command completes successfully. WARNING: RemoveFunction: Function "name" ("types") does not exist This message is given if the function specified does not exist in the current database. 1998-04-15 DROP FUNCTION will remove the definition of an existing function. To execute this command the user must be the owner of the function. The input argument types to the function must be specified, since several different functions may exist with the same name and different argument lists. Refer to for information on creating functions. This command removes the square root function: DROP FUNCTION sqrt(integer); A DROP FUNCTION statement is defined in SQL99. One of its syntax forms is similar to PostgreSQL's.