suse man page for drop_function

DROP 
FUNCTION(7)						   SQL Commands 						  DROP FUNCTION(7)

NAME
       DROP FUNCTION - remove a function

SYNOPSIS
       DROP FUNCTION [ IF EXISTS ] name ( [ [ argmode ] [ argname ] argtype [, ...] ] )
	   [ CASCADE | RESTRICT ]

DESCRIPTION
       DROP FUNCTION removes the definition of an existing function. To execute this command the user must be the owner of the function. The argu-
       ment types to the function must be specified, since several different functions can exist with the same name and different argument lists.

PARAMETERS
       IF EXISTS
	      Do not throw an error if the function does not exist. A notice is issued in this case.

       name   The name (optionally schema-qualified) of an existing function.

       argmode
	      The mode of an argument: IN, OUT, INOUT, or VARIADIC.  If omitted, the default is IN.  Note that DROP FUNCTION does not actually pay
	      any attention to OUT arguments, since only the input arguments are needed to determine the function's identity.  So it is sufficient
	      to list the IN, INOUT, and VARIADIC arguments.

       argname
	      The name of an argument.	Note that DROP FUNCTION does not actually pay any attention to argument names,	since  only  the  argument
	      data types are needed to determine the function's identity.

       argtype
	      The data type(s) of the function's arguments (optionally schema-qualified), if any.

       CASCADE
	      Automatically drop objects that depend on the function (such as operators or triggers).

       RESTRICT
	      Refuse to drop the function if any objects depend on it. This is the default.

EXAMPLES
       This command removes the square root function:

       DROP FUNCTION sqrt(integer);

COMPATIBILITY
       A DROP FUNCTION statement is defined in the SQL standard, but it is not compatible with this command.

SEE ALSO
       CREATE FUNCTION [create_function(7)], ALTER FUNCTION [alter_function(7)]

SQL - Language Statements					    2010-05-14							  DROP FUNCTION(7)