sql 查詢結(jié)果合并union all用法_數(shù)據(jù)庫技巧
發(fā)布日期:2022-01-30 17:23 | 文章來源:源碼之家
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
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