mysql 多表查詢先排序，然后再取分組

select * from (
        select cv.lasttime,cm.mailbox,cv.clientip from `co_user_visitlog` as cv INNER JOIN `core_mailbox` as cm where cv.mailbox_id = cm.mailbox_id and cm.mailbox in 
　　　　　　 (
                   '[e-mail]','[e-mail]','[e-mail]','[e-mail]'
            )order by cv.lasttime desc
    　　　　) as t
    group by t.mailbox;

 

在一條語句里面不可以先order by 再進行group by

 

最終套了一個查詢，然后再group by 出來