程序師世界是廣大編程愛好者互助、分享、學習的平台,程序師世界有你更精彩!
首頁
編程語言
C語言|JAVA編程
Python編程
網頁編程
ASP編程|PHP編程
JSP編程
數據庫知識
MYSQL數據庫|SqlServer數據庫
Oracle數據庫|DB2數據庫
 程式師世界 >> 數據庫知識 >> 其他數據庫知識 >> MSSQL >> sql 查詢成果歸並union all用法_數據庫技能

sql 查詢成果歸並union all用法_數據庫技能

編輯:MSSQL

sql 查詢成果歸並union all用法_數據庫技能。本站提示廣大學習愛好者:(sql 查詢成果歸並union all用法_數據庫技能)文章只能為提供參考,不一定能成為您想要的結果。以下是sql 查詢成果歸並union all用法_數據庫技能正文



--歸並反復行
select * from A
union
select * from B


--不歸並反復行
select * from A
union all
select * from B


按某個字段排序
--歸並反復行
select *
from (
select * from A
union
select * from B) AS T
order by 字段名

--不歸並反復行
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
  1. 上一頁:
  2. 下一頁:
Copyright © 程式師世界 All Rights Reserved