MySQL嵌套优化

Question

我一直试图解决这个问题2个小时，但不能成功

以下是此查询的回复：

SELECT login, SUM(gain) AS weekly_gain
FROM gt_history
WHERE is_closed = 1 AND (cmd = 0 OR cmd = 1)
GROUP BY WEEK(close_time), login

现在，我想要做的是，AVERAGE登录所有值GROUP BY。

想法？

Answer 1

SELECT
  login,
  AVG(weekly_gain) AS weekly_gain
FROM (SELECT
    login,
    SUM(gain) AS weekly_gain
      FROM gt_history
      WHERE is_closed = 1
      AND (cmd = 0
        OR cmd = 1)
      GROUP BY WEEK(close_time), login) As l

Answer 2

只需使用查询即可作为子查询。

SELECT login, AVG(weekly_gain) FROM
    (SELECT login, SUM(gain) AS weekly_gain
    FROM gt_history
    WHERE is_closed = 1 AND (cmd = 0 OR cmd = 1)
    GROUP BY WEEK(close_time), login)
GROUP BY login