--合并重复行select * from Aunion select * from B--不合并重复行select * from Aunion allselect * from B按某个字段排序--合并重复行select *from (select * from Aunion select * from B) AS Torder by 字段名--不合并重复行select *from (select * from Aunion allselect * from B) AS Torder 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) AUnion AllSelect * From (select top 2 id,adddate,title,url from bArticle where ClassId=2 order by adddate desc) BUnion AllSelect * From (select top 2 id,adddate,title,url from bArticle where ClassId=3 order by adddate desc) CUnion AllSelect * 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) AUnion AllSelect * From (select id,adddate,title,url from bArticle where ClassId=2 order by adddate desc limit 0,2) BUnion AllSelect * From (select id,adddate,title,url from bArticle where ClassId=3 order by adddate desc limit 0,2) CUnion AllSelect * From (select id,adddate,title,url from bArticle where ClassId=4 order by adddate desc limit 0,2) D