NAME

DROP FUNCTION - 刪除一個函數

SYNOPSIS

DROP FUNCTION name ( [ type [, ...] ] ) [ CASCADE | RESTRICT ]

DESCRIPTION 描述

DROP FUNCTION 將刪除一個現存的函數的引用。 要執行這條命令，用戶必須是函數的所有者。 必須聲明函數的參數類型，因為幾個不同的函數可能會有同樣的名字和不同的參數列表。  

PARAMETERS 參數

name

 現存的函數名稱（可以有模式修飾）。

type

 函數參數的類型。

CASCADE

 自動刪除依賴于函數的對象（比如操作符或觸發器）。

RESTRICT

 如果有任何依賴對象存在，則拒絕刪除該函數。這個是缺省。

EXAMPLES 例子

 這條命令刪除平方根函數：

DROP FUNCTION sqrt(integer);

COMPATIBILITY 兼容性

 在 SQL 標準里定義了一個 DROP FUNCTION 語句。 但和這條命令不兼容。  

SEE ALSO 參見

CREATE FUNCTION [create_function(7)], ALTER FUNCTION [alter_function(l)]

#p#

NAME

DROP FUNCTION - remove a function

SYNOPSIS

DROP FUNCTION name ( [ type [, ...] ] ) [ 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 may exist with the same name and different argument lists.  

PARAMETERS

name

The name (optionally schema-qualified) of an existing function.

type

The data type of an argument of the function.

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(l)]