NAME

DROP TRIGGER - 刪除一個觸發(fā)器定義

SYNOPSIS

DROP TRIGGER name ON table [ CASCADE | RESTRICT ]

DESCRIPTION 描述

DROP TRIGGER 將刪除所有對一個現(xiàn)存觸發(fā)器的引用。 要執(zhí)行這個命令，當(dāng)前用戶必須是觸發(fā)器的所有者。  

PARAMETERS 參數(shù)

name

 要刪除的觸發(fā)器名。

table

 觸發(fā)器定義所在的表的名稱（可以有模式修飾）。

CASCADE

 自動刪除依賴此觸發(fā)器的對象。

RESTRICT

 如果有任何依賴對象存在，那么拒絕刪除。這個是缺省。

EXAMPLES 例子

 刪除表films的if_dist_exists觸發(fā)器：

DROP TRIGGER if_dist_exists ON films;

COMPATIBILITY 兼容性

PostgreSQL 里的 DROP TRIGGER 語句和 SQL 標(biāo)準(zhǔn)不兼容。在 SQL 標(biāo)準(zhǔn)里，觸發(fā)器名字不是表所局部擁有的，所以命令只是簡單的 DROP TRIGGER name。  

SEE ALSO 參見

CREATE TRIGGER [create_trigger(7)]

#p#

NAME

DROP TRIGGER - remove a trigger

SYNOPSIS

DROP TRIGGER name ON table [ CASCADE | RESTRICT ]

DESCRIPTION

DROP TRIGGER will remove an existing trigger definition. To execute this command, the current user must be the owner of the table for which the trigger is defined.  

PARAMETERS

name

The name of the trigger to remove.

table

The name (optionally schema-qualified) of a table for which the trigger is defined.

CASCADE

Automatically drop objects that depend on the trigger.

RESTRICT

Refuse to drop the trigger if any objects depend on it. This is the default.

EXAMPLES

Destroy the trigger if_dist_exists on the table films:

DROP TRIGGER if_dist_exists ON films;

COMPATIBILITY

The DROP TRIGGER statement in PostgreSQL is incompatible with the SQL standard. In the SQL standard, trigger names are not local to tables, so the command is simply DROP TRIGGER name.  

SEE ALSO

CREATE TRIGGER [create_trigger(7)]