SQL Server sql 查询结果合并union all用法

2022-11-12 09:54:01
内容摘要
这篇文章主要为大家详细介绍了SQL Server sql 查询结果合并union all用法,具有一定的参考价值,可以用来参考一下。 对此感兴趣的朋友,看看idc笔记做的技术笔记! 代码如下: --
文章正文

这篇文章主要为大家详细介绍了SQL Server sql 查询结果合并union all用法,具有一定的参考价值,可以用来参考一下。

对此感兴趣的朋友,看看idc笔记做的技术笔记!

代码如下:

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<code>--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
</code>

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代码注释

作者:喵哥笔记

IDC笔记

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