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 程式師世界 >> 數據庫知識 >> 其他數據庫知識 >> 更多數據庫知識 >> sql 查詢結果合並union all用法_數據庫技巧

sql 查詢結果合並union all用法_數據庫技巧

編輯:更多數據庫知識

復制代碼 代碼如下:
--合並重復行
select * from A
union
select * from B


--不合並重復行
select * from A
union all
select * from B


按某個字段排序
--合並重復行
select *
from (
select * from A
union
select * from B) AS T
order by 字段名

--不合並重復行
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

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