DROP ROUTINE
DROP ROUTINE — remove a routine
Synopsis
DROP ROUTINE [ IF EXISTS ]name[ ( [ [argmode] [argname]argtype[, ...] ] ) ] [, ...] [ CASCADE | RESTRICT ]
Description
DROP ROUTINE removes the definition of an existing routine, which can be an aggregate function, a normal function, or a procedure. See under DROP AGGREGATE, DROP FUNCTION, and DROP PROCEDURE for the description of the parameters, more examples, and further details. 
Examples
 To drop the routine foo for type integer: 
DROP ROUTINE foo(integer);
 This command will work independent of whether foo is an aggregate, function, or procedure. 
Compatibility
This command conforms to the SQL standard, with these Postgres Pro extensions:
- The standard only allows one routine to be dropped per command. 
- The - IF EXISTSoption
- The ability to specify argument modes and names 
- Aggregate functions are an extension. 
See Also
DROP AGGREGATE, DROP FUNCTION, DROP PROCEDURE, ALTER ROUTINE Note that there is no CREATE ROUTINE command.