复制代码 代码如下: --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)
复制代码 代码如下:--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
