MySQL GROUP BY並按列排序組

Question

我想按特定列排序組。

我試過如下：

SELECT u.level, max(u.score),n.nick 
FROM database.userdata u, database.nicks n 
WHERE n.user = u.id 
GROUP BY level 

但這只是打印最高得分，而不是爲這個分數的用戶名..

我怎樣才能解決這個問題？

謝謝！

Answer 1

試試這個方法：

SELECT n.nick, u1.score, u1.level 
FROM database.nicks AS n 
JOIN database.userdata AS u1 ON n.user = u1.id 
JOIN (
    SELECT level, max(score) AS score 
    FROM database.userdata 
    GROUP BY level 
) AS u2 ON u1.level = u2.level AND u1.score = u2.score