php - 如何在php mysql中制作排名系统？

Question

我有一个带有锻炼表的 php 应用程序，我在其中存储基于事件(例如:运行、步行、骑自行车)的日常用户锻炼数据。在月底，我必须创建一个排行榜，以根据最高锻炼分数生成排名。

SELECT total_distance, user_id,date_created 
   FROM workouts 
   WHERE date_created LIKE '%2019-11%' AND activity_type='Run'. 

通过上述查询，我​​得到如下所述的输出

我通过在查询中使用 GROUP BY user_id 优化了查询。

SELECT SUM(total_distance) as points, user_id,date_created 
    FROM workouts 
    WHERE date_created LIKE '%2019-11%' AND activity_type='Run' 
    GROUP BY user_id

我希望我的最终输出如第二张图片所示以及作为新列的排名。 如何为此编写查询。我做不到..

Answer 1

   SELECT 
   CASE WHEN @l=points THEN @rank ELSE @rank:=@rank+1 END as rank,@l:=points ,points,user_id from (select 
   SUM(total_distance) as points, user_id,date_created 
    FROM workouts 
    WHERE date_created LIKE '%2019-07%'  
    GROUP BY user_id order by points desc) a, (SELECT@rank := 0) vars;

SQL 演示在这里 http://sqlfiddle.com/#!9/0e8634/2