DROP_FUNCTION(7) - Man pages

DROP FUNCTION(7)         PostgreSQL 15.7 Documentation        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. If
           no argument list is specified, the name must be unique in its
           schema.

       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), and in turn all objects that depend on
           those objects (see Section 5.14).

       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);

       Drop multiple functions in one command:

           DROP FUNCTION sqrt(integer), sqrt(bigint);

       If the function name is unique in its schema, it can be referred to
       without an argument list:

           DROP FUNCTION update_employee_salaries;

       Note that this is different from

           DROP FUNCTION update_employee_salaries();

       which refers to a function with zero arguments, whereas the first
       variant can refer to a function with any number of arguments, including
       zero, as long as the name is unique.

COMPATIBILITY
       This command conforms to the SQL standard, with these PostgreSQL
       extensions:

       •   The standard only allows one function to be dropped per command.

       •   The IF EXISTS option

       •   The ability to specify argument modes and names

SEE ALSO
       CREATE FUNCTION (CREATE_FUNCTION(7)), ALTER FUNCTION
       (ALTER_FUNCTION(7)), DROP PROCEDURE (DROP_PROCEDURE(7)), DROP ROUTINE
       (DROP_ROUTINE(7))

PostgreSQL 15.7                      2024                     DROP FUNCTION(7)

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