DROP FUNCTION() SQL Commands DROP FUNCTION()NAME
DROP FUNCTION - remove a function
DROP FUNCTION [ IF EXISTS ] name ( [ [ argmode ] [ argname ] argtype [, ...] ] )
[ CASCADE | RESTRICT ]
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.
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.
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.
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.
The data type(s) of the function's arguments (optionally schema-
qualified), if any.
Automatically drop objects that depend on the function (such as
operators or triggers).
Refuse to drop the function if any objects depend on it. This is
This command removes the square root function:
DROP FUNCTION sqrt(integer);
A DROP FUNCTION statement is defined in the SQL standard, but it is not
compatible with this command.
CREATE FUNCTION [create_function(5)], ALTER FUNCTION [alter_func‐
SQL - Language Statements 2008-01-03 DROP FUNCTION()