1、单表更新多个字段
DB2:
- update t1 set (id, name)=('1','2') where name like 'kiss%'--正确运行
- update t1 set id='1',name='2' where name like 'kiss%'--正确运行
MSSQL:
- update t1 set (id, name)=('1','2') where name like 'kiss%'----报： '(' 附近有语法错误。
- update t1 set id='1',name='2' where name like 'kiss%'--正确运行
2、多表连合更新
DB2:
- update t1 set id=(select id from t2 where t2.name like 'kiss%'--正确运行
- update t1 set (id,name)=(select id,name from t2 where t2.name like 'kiss%'--正确运行
- update t1 a set id=b.id from t2 b where b.id='dkdkd'--sql遇到非法符号
MSSQL:(update tablename 别名，这种写法是不对的)
- update t1 set id=b.id, bid=b.bid from t2 b where b.bid='dkdkd' --正确运行
- -----如果要用别名，则也要把t1放在from后面------
- update a set a.id=b.id, a.bid=b.bid from t1 a, t2 b where a.id=b.id and b.bid='dkdkd' --正确运行(别名放在from后)
综上，更新多个字段，有两种写法，分别是
- update tname set (a1, a2...)=(select a1, a2...from...)--DB2写法
- --------------------华丽分割线----------
- update tname set a1=b.a2, a2=b.a2...from b... --mssql 写法
Oracle下面跟db2差不多，环境没搭建好，就不测试了，要用的时候再参考以上两种写法.
简单在mysql下测试，结果如下，mysql与mssql都支持 set a1=b.a2, a2=b.a2...from b. 的写法
- mysql> update order2 set id=1,price=2 where ordernum='kdkdk'
- -> ;
- Query OK, 0 rows affected (0.00 sec)
- Rows matched: 0 Changed: 0 Warnings: 0
- mysql> update order2 set (id, price)=(1,2) where ordernum='dkdkd'
- -> ;
- ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
- corresponds to your MySQL server version for the right syntax to use near '(id,
- price)=(1,2) where ordernum='dkdkd'' at line 1
原文链接： http://shoushou2001.iteye.com/blog/1110350
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