为什么在这里不能用group by?
select * from(
select t.articleid,t.filt_content,t.stat,t.createdate,s.articlename
from pms_wapcomment t  
inner join pms_article s on t.articleid=s.id
where t.stat=1 
order by t.createdate desc)
group by t.articleid
where rownum <=5
我想按文章ID分组，可是说命令未正确结束
请高手指点

------解决方案--------------------
比如有三列
1,'aa'
2,'bb'
2,'cc'
你现在按照ID进行分组了，id=2的有两列，你通过'*'来检索字段，
你让oracle是选'bb',还是'cc'呢?
所以，你必须只能够检索出你分组的字段
select t.articleid from(
select t.articleid,t.filt_content,t.stat,t.createdate,s.articlename
from pms_wapcomment t
inner join pms_article s on t.articleid=s.id
where t.stat=1
order by t.createdate desc)
group by t.articleid
where rownum <=5
------解决方案--------------------

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from pms_wapcomment t
inner join pms_article s on t.articleid=s.id
where t.stat=1
order by t.createdate desc)……