DROP TRIGGER if_dist_exists ON films; 1. COMPATIBILITY 兼容性 PostgreSQL 里的 DROP TRIGGER 语句和 SQL 标准不兼容。在 SQL 标准里,触发器名字不是表所局部拥有的,所以命令只是简单的 DROP TRIGGER name。 SEE ALSO 参见 CREATE TRIGGER [create_trigger(7)] #p# NAME DROP TRIGGER - remove a trigger ...
-- 定义触发器.CREATE TRIGGER tr_delete_test BEFORE DELETE ON test_trigger_table FOR EACH ROW EXECUTE PROCEDURE TrDeleteTest();-- 删除触发器.DROP TRIGGER tr_delete_test ON test_trigger_table ;
If theWHEREclause is absent, the effect is to delete all rows in the table. The result is a valid, but empty table. Tip:TRUNCATEis aPostgreSQL extension that provides a faster mechanism to remove all rows from a table. By default,DELETEwill delete rows in the specified table and all its...
* necessary infrastructure for such triggers. * * This division is not just for performance: it's critical that the * event trigger code not be invoked when doing START TRANSACTION for * example, because we might need to refresh the event trigger cache, * which requires being in a valid ...
Since functions can be overloaded, PostgreSQL needs to know which function you want to remove by checking the argument list. If a function is unique within the schema, you do not need to specify the argument list. When a function has any dependent objects such as operators or triggers, you...
DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. 1. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, CASCADE must be specified. ...
is called the tablespace in PostgreSQL. The data can be tables, triggers indexes, etc. However, if a tablespace is no longer needed, it can be dropped in PostgreSQL. The tablespace can be dropped by the owner of the tablespace. In this blog, we will drop the tablespace in PostgreSQL. ...
When you remove a column from a table, PostgreSQL will automatically remove all of the indexes and constraints that involved the dropped column. If the column that you want to remove is used in other database objects such as views, triggers, and stored procedures, you cannot drop the column...
argmode一个参数的模式:IN、OUT、INOUT或者VARIADIC。如果被忽略, 则默认为IN。注意DROP FUNCTION并不真正关心OUT参数,因为决定函数的身份时只需要输入参数。 因此列出IN、INOUT和VARIADIC参数就可以。 argname一个参数的名称。注意DROP FUNCTION并不真正关心参数名称,因为决定函数的身份时只需要参数的数据类型。
IFTTT(If This Then That)是一种自动化工具,它允许用户创建称为“applets”的自动化任务,以便在一个应用程序中发生特定事件时触发另一个应用程序中的操作。在这种情况下,我们将讨论如何使用IFTTT将图像从Dropbox发送到Telegram。 IFTTT提供了一个名为“applet”的概念,它由两个部分组成:触发器(Trigger)和操作(Action...