如何在查询结果中添加排名或行号？

Question

I have below query which is returning result, but I need to add row number or rank. Working query is following

SELECT  user_id, CAST(SUM(total_score) / 100 AS DECIMAL(10,2)) AS points
FROM users_games 
GROUP BY user_id
HAVING points > 500 AND points < 5000
ORDER BY points DESC

I tried following for getting row number and rank

SET @rank=0; 
SELECT @rank:=@rank+1, user_id, CAST(SUM(total_score) / 100 AS DECIMAL(10,2)) AS points
FROM users_games
GROUP BY user_id
HAVING points > 500 AND points < 5000
ORDER BY points DESC;
SELECT @rank;

Answer 1

In older versions of MySQL and MariaDB, you can use variables:

SELECT (@rn := @rn + 1), ug.*
FROM (SELECT  user_id, CAST(SUM(total_score) / 100 AS DECIMAL(10,2)) AS points
      FROM users_games 
      GROUP BY user_id
      HAVING points > 500 AND points < 5000
      ORDER BY points DESC
     ) ug CROSS JOIN
     (SELECT @rn := 0) params;