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 argument 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                                  2011-09-22                                           DROP FUNCTION(7)