復(fù)制代碼 代碼如下:
--合并重復(fù)行
select * from A
union
select * from B
--不合并重復(fù)行
select * from A
union all
select * from B
按某個(gè)字段排序
--合并重復(fù)行
select *
from (
select * from A
union
select * from B) AS T
order by 字段名
--不合并重復(fù)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
您可能感興趣的文章:- sql Union和Union All的使用方法
- sqlserver Union和SQL Union All使用方法
- Sql學(xué)習(xí)第一天——SQL UNION 和 UNION ALL 操作符認(rèn)識(shí)
- Mysql聯(lián)合查詢UNION和UNION ALL的使用介紹
- MySQL中使用or、in與union all在查詢命令下的效率對(duì)比
- SQL語句之Union和Union All的用法
