DROP FUNCTION SQL - Language Statements DROP FUNCTION remove a user-defined function 1999-07-20 DROP FUNCTION name ( [ type [, ...] ] ) 1998-04-15 name The name of an existing function. type The type of function parameters. 1998-04-15 DROP Message returned if the command completes successfully. NOTICE 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 references to an existing C function. To execute this command the user must be the owner of the function. The input argument types to the function must be specified, as only the function with the given name and argument types will be removed. Refer to for information on creating functions. No checks are made to ensure that types, operators or access methods that rely on the function have been removed first. 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: DROP FUNCTION name (arg, ...) { RESTRICT | CASCADE } where CASCADE specifies dropping all objects that depend on the function and RESTRICT refuses to drop the function if dependent objects exist.