mysql 并列排名

    
        select * from (
        select
        CASE
        WHEN @point = temp.point THEN @rownum
        WHEN @point := temp.point THEN @rownum := @rownum + 1
        WHEN @point = 0 THEN @rownum := @rownum + 1
        END AS rank,
        temp.* from (
        select ifnull(sum(amount),0) point ,user_id userId ,cu.nick_name nickName from caiyi_point_record cpr
        left join caiyi_user cu on cpr.user_id =cu.id
        
            
                and cpr.create_time >= #{activityStartTime}
            
            
                and cpr.create_time <= #{activityEndTime}
            
        
        group by cpr.user_id
        order by point desc
        
            limit ${activitySortCount}
        
        ) temp ,(select @rownum:=0,@point :=null ) d) temp1
        
            
                temp1.userId=#{userId}