Mysql 中根據條件排序獲取排名

      SELECT user_id,left_credit,(@rownum:=@rownum+1) AS rownum
      FROM credit_user ,(SELECT @rownum:=0) r
      ORDER BY left_credit DESC

上面示例根據left_credit字段條件進行倒序排序，然后通過rownum獲取到排名從1開始

 

      SELECT user_id,left_credit,(@rownum:=@rownum+1) AS rownum
      FROM credit_user 
      ORDER BY left_credit DESC

 去掉 (SELECT @rownum:=0) r 后，rownum就不是每次控制從1開始，而是沒執行一次就逐次自增

   select * from (SELECT user_id,left_credit,(@rownum:=@rownum+1) AS rownum
      FROM credit_user ,(SELECT @rownum:=0) r
      ORDER BY left_credit DESC)T having rownum>n

排序后 選擇某一行或者某幾行，n是行數。