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 id4 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 id2 name3 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