MySQL的嵌套優化

Question

我一直在試圖解決現在這個2小時，並不能成功

附在下面是該查詢的響應：

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 

現在，我想要做的是，要製作一個AVERAGE的所有值，請登錄GROUP BY。

想法？

Answer 1

只需使用查詢你的子查詢。

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 

Answer 2

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