select id, (@rowno := @rowno + 1) as rank,
 score,
 (C.end_time - C.start_time) as timeConsuming,
 start_time,
 real_name,
 tel,
 expiry_code
 from (SELECT *
  FROM (select *
   from t_q_order B
   where B.score > 0
   and B.tel IS NOT NULL
   order by B.score desc,
    (B.end_time - B.start_time) asc,
    B.start_time asc) as A
  group by A.tel
  ORDER BY A.score desc,
   (A.end_time - A.start_time) asc,
   A.start_time asc) 
 as C,
 (select @rowno := 0) t
 where (C.end_time - C.start_time) > 5 limit 0,50;