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sql 查询结果合并union all用法_数据库技巧
来源: 互联网 发布时间:2014-09-05
本文导语: 代码如下:--合并重复行 select * from A union select * from B --不合并重复行 select * from A union all select * from B 按某个字段排序 --合并重复行 select * from ( select * from A union select * from B) AS T order by 字段名 --不合并重复行 select * from ( select * ...
代码如下:
--合并重复行
select * from A
union
select * from B
--不合并重复行
select * from A
union all
select * from B
按某个字段排序
--合并重复行
select *
from (
select * from A
union
select * from B) AS T
order by 字段名
--不合并重复行
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