整理別人的sql
大概的思想是用union 和union all
--合併重複行
select * from a
union
select * from b
--不合併重複行
select * from a
union all
select * from b
按某個字段排序
--合併重複行
select *
from (
select * from a
union
select * from b) as t
order by 欄位名
--不合併重複行
select *
from (
select * from a
union all
select * from b) as t
order by 欄位名
//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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