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sqlserver 比较两个表的列

WBOY
WBOYOriginal
2016-06-07 17:58:261254browse

sqlserver 比较两个表的列的实现代码。

一、问题
给了两个各有四五十个列的表,找出他们相同的列和不同的列

二、查询两个表的列,存在临时表

--#a ,#b都是临时表,当前连接断开后自动删除
--RANK() OVER (ORDER BY syscolumns.name DESC) AS 是SQL2005支持的,在每行记录前加上自增序号
--IDENTITY(INT,1,1) 函数必须要和into联合使用

1、将表的列存入#a--'destTbl'比较的表名

select * into #a from (select RANK() OVER (ORDER BY syscolumns.name DESC) AS 序号,syscolumns.name
from syscolumns,sysobjects
where syscolumns.[id]=sysobjects.[id]
and sysobjects.[name]='destTbl') as t

select * from #a

1 姓名
2 课程
3 id
4 cno

2、将表的列存入#b--'student'比较的表名

select 序号= IDENTITY(INT,1,1),syscolumns.name
into #b from syscolumns,sysobjects
where syscolumns.[id]=sysobjects.[id]
and sysobjects.[name]='student'


select * from #b

1 id
2 name
3 cno

三、分析比较各个表列的异同

用下列语句,或者稍作改动比较
select * from #b where name in (select name from #a)
select * from #a where name not in (select name from #b)
select * from #a a, #b b where a.name=b.name
select * from #a a left join #b b on a.name=b.name

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