xenial (7) DROP_FUNCTION.7.gz

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))