sqlserver 比較兩個(gè)表的列

sqlserver 比較兩個(gè)表的列的實(shí)現(xiàn)代碼。

一、問題
給了兩個(gè)各有四五十個(gè)列的表，找出他們相同的列和不同的列

二、查詢兩個(gè)表的列，存在臨時(shí)表

–#a ,#b都是臨時(shí)表，當(dāng)前連接斷開后自動(dòng)刪除
–RANK() OVER (ORDER BY syscolumns.name DESC) AS 是SQL2005支持的，在每行記錄前加上自增序號(hào)
–IDENTITY(INT,1,1) 函數(shù)必須要和into聯(lián)合使用

1、將表的列存入#a–‘destTbl’比較的表名

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

select * from #a

1 姓名
2 課程
3 id
4 cno

2、將表的列存入#b–‘student’比較的表名

select 序號(hào)= 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、分析比較各個(gè)表列的異同

用下列語句，或者稍作改動(dòng)比較
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