SQL：找出我（uid=2）所有的好友信息，和这些好友发布的最新的一篇文章

select f.fid, u.nick_name, u.uname, u.icon ,t.content, t.add_time
from friends f, user u , (select content, add_time,uid from topic order by add_time desc) t
where f.uid = 2
and f.fid = u.id
and t.uid = f.fid
group by f.fid
order by f.add_time desc