drop_function(5)

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 exe-
       cute 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 may 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: either IN, OUT, or INOUT. If omitted,
              the default is IN.  Note that DROP FUNCTION  does  not  actually
              pay  any  attention to OUT arguments, since only the input argu-
              ments are needed to determine the function's identity.  So it is
              sufficient to list the IN and INOUT arguments.

       argname
              The name of an argument.  Note that DROP FUNCTION does not actu-
              ally pay any attention to argument names, since only  the  argu-
              ment 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(5)],  ALTER  FUNCTION  [alter_func-
       tion(l)]

SQL - Language Statements         2008-06-08                   DROP FUNCTION()