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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 argu-
              ments.

       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         2014-02-17                  DROP FUNCTION(7)