sqlÓï¾ä²éѯ½á¹ûºÏ²¢union allÓ÷¨_Êý¾Ý¿â¼¼ÇÉ

--ºÏ²¢Öظ´ÐÐ
select * from A
union
select * from B
--²»ºÏ²¢Öظ´ÐÐ
select * from A
union all
select * from B
°´Ä³¸ö×Ö¶ÎÅÅÐò
--ºÏ²¢Öظ´ÐÐ
select *
from (
select * from A
union
select * from B) AS T
order by ×Ö¶ÎÃû
--²»ºÏ²¢Öظ´ÐÐ
select *
from (
select * from A
union all
select * from B) AS T
order by ×Ö¶ÎÃû
//sql server°æ
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°æ
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