程序師世界是廣大編程愛好者互助、分享、學習的平台,程序師世界有你更精彩!
首頁
編程語言
C語言|JAVA編程
Python編程
網頁編程
ASP編程|PHP編程
JSP編程
數據庫知識
MYSQL數據庫|SqlServer數據庫
Oracle數據庫|DB2數據庫
 程式師世界 >> 數據庫知識 >> MYSQL數據庫 >> MySQL綜合教程 >> mysql多表join時刻update更新數據的辦法

mysql多表join時刻update更新數據的辦法

編輯:MySQL綜合教程

mysql多表join時刻update更新數據的辦法。本站提示廣大學習愛好者:(mysql多表join時刻update更新數據的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是mysql多表join時刻update更新數據的辦法正文


sql語句:

update item i,resource_library r,resource_review_link l set i.name=CONCAT('Review:',r.resource_name) where i.item_id=l.instance_id
and l.level='item' and r.resource_id=l.resource_id and i.name=''


JOIN UPDATE & JOIN DELETE

update a
set a.schoolname = b.schoolname
from tb_Std as a join tb_Sch as b on a.School = b.School
where a.std_year = 2005
go
/*
(2 row(s) affected)
*/
select *
from tb_Std as a join tb_Sch as b on a.School = b.School
/*
A School A A School
2 2005 A A School A A School
3 2004 C A School C C School
4 2005 D D School D D School
(4 row(s) affected)
*/


delete a
from table1 a, table2 b
where a.col1 = b.col1
and a.col2 = b.col2

The above SQL statement runs fine in SQL Server.
If the Oracle 9i has different syntax or if there is any other way to accomplish this with a single delete statement that would be really helpful.

> Hi,
>
> Is the following delete statement possible in Oracle 9i.
>
> delete a
> from table1 a, table2 b
> where a.col1 = b.col1
> and a.col2 = b.col2
>
> The above SQL statement runs fine in SQL Server.
>
> If the Oracle 9i has different syntax or if there is any other way to accomplish this with a single delete statement that would be really helpful.
>
> Thanx in advance.
>
> -Bheem
Bheem,
Try this:
DELETE FROM table1 a where exists (select 1 from table2 b
where a.col1 = b.col1 and a.col2 = b.col2);
Hope this helps,
Tom K.
  1. 上一頁:
  2. 下一頁:
Copyright © 程式師世界 All Rights Reserved