整理别人的sql
大概的思想是用union 和union all
--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
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