小编rya*_*eld的帖子

SELECT vt.vtid, vt.tag, vt.typeid, vt.id, vt.count, tt.type, u.username, vt.date_added, tc.context, tc.contextid
FROM ( vt, tt, u )
LEFT JOIN tc ON ( vt.vtid = tc.vtid AND tc.userid = vt.userid ) 
WHERE vt.typeid = tt.typeid
AND vt.verified =0
AND vt.userid = u.userid
ORDER BY vt.date_added DESC 
LIMIT 1

需要.0007才能完成

id   select_type     table   type    possible_keys           key             key_len         ref                         rows            Extra
1   SIMPLE          vt      ref     typeid,userid,verified  verified        1               const                       9               Using where; Using filesort
1   SIMPLE          tt      eq_ref  PRIMARY                 PRIMARY         4               vt.typeid       1 …