更新: CREATE TRIGGER `r_users_1` AFTER UPDATE ON `users` FOR EACH ROW update `wxusers` set status=NEW.status where wxusers.uid = new.id; 删除触发器:drop trigger r_users_1;
在sql server中,取数据中前10条语句,我们可以用top 10 这样语句,但是oracle就没有这个函数,接下来介绍它们之间的区别 1.sql server 取前10语句和随机10条的语法 --测试表数据-- select * from BdsPaperItem --查询测试表的前10条语句-- * from BdsPaperItem order by Uid asc --随机查询测试表10条语句-- * from BdsPaperItem order by NEWID() 结果实例:
/*第一种实现方法,效率低并且有错误*/ DECLARE @DD DATETIME SET @DD = GETDATE() SELECT a.GoodsID , a.Account , a.LastUpdate FROM dbo.tb_App_Goods a LEFT JOIN dbo.tb_App_Goods b ON a.Account = b.Account AND a.LastUpdate > b.LastUpdate GROUP BY a.GoodsID , a.Account , a
),age )) create or replace trigger gger_tt before insert on ttt for each row when (new.id is null) begin select ttt_sequence.nextval into :new.id from dual; end;
create table UserType ( Id ,), Name nvarchar() not null ) go create table UserInfo ( Id ,), LoginPwd varchar() not ) not ) not check(Gender= or Gender=), Email varchar() not ) not ) default '这个人很懒,什么都没有留下', UserTypeId int foreign key references UserT
-- SQL SERVER 判断是否存在某个触发器.储存过程 -- 判断储存过程,如果存在则删除IF (EXISTS(SELECT * FROM sysobjects WHERE name='procedurename' AND type='P')) DROP PROCEDURE procedurename -- 判断触发器,如果存在则删除IF (EXISTS(SELECT * FROM sysobjects WHERE id=object_id(N'[dbo].[triggername]')
mysql定时删除当前时间前分钟的数据 2013-01-31 0个评论 作者:上官车月 收藏 我要投稿 mysql定时删除当前时间前分钟的数据 Sql代码 www.2cto.com SET GLOBAL event_scheduler = ON; delimiter $$ drop event if exists e_wom_stat; create event e_wom_stat on schedule EVERY 1 day