DROP FUNCTION - remove a function
DROP FUNCTION name ( [ [ argmode ] [ argname ] argtype [, ...] ] ) [ CASCADE | RESTRICT ]
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 may exist with the same name and different argument lists.
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 arguments are needed to determine the functions identity. So it is sufficient to list the IN and INOUT 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 functions identity. argtype The data type(s) of the functions 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.
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(7)], ALTER FUNCTION [alter_function(l)]
|SQL - Language Statements||DROP FUNCTION ()||2010-12-14|