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 程式師世界 >> 數據庫知識 >> SqlServer數據庫 >> 關於SqlServer >> sql語句查詢結果合並union all用法

sql語句查詢結果合並union all用法

編輯:關於SqlServer

整理別人的sql

大概的思想是用union 和union all

--合並重復行
select * from A
union
select * from B

--不合並重復行
select * from A
union all
select * from B

按某個字段排序
--合並重復行
select *
from (
select * from A
union
select * from B) AS T
order by 字段名

--不合並重復行
select *
from (
select * from A
union all
select * from B) AS T
order by 字段名

//sql server版
Select * From (
select top 2 id,adddate,title,url from bArticle where ClassId='1' order by adddate desc) A
Union All
Select * From (
select top 2 id,adddate,title,url from bArticle where ClassId='2' order by adddate desc) B
Union All
Select * From (
select top 2 id,adddate,title,url from bArticle where ClassId='3' order by adddate desc) C
Union All
Select * From (
select top 2 id,adddate,title,url from bArticle where ClassId='4' order by adddate desc) D

//mysql版
Select * From (
select id,adddate,title,url from bArticle where ClassId='1' order by adddate desc limit 0,2) A
Union All
Select * From (
select id,adddate,title,url from bArticle where ClassId='2' order by adddate desc limit 0,2) B
Union All
Select * From (
select id,adddate,title,url from bArticle where ClassId='3' order by adddate desc limit 0,2) C
Union All
Select * From (
select id,adddate,title,url from bArticle where ClassId='4' order by adddate desc limit 0,2) D
http://blog.csdn.net/kemy88/archive/2007/02/28/1516913.aspx

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