如何獲得多個最大列值的MySQL

Question

我想查詢使用連接表，但我不能讓這裏成功我的表

Score 
id , user_id ,  score , week 
1  , 123  ,  2  , 1 
2  , 432  ,  2  , 1 
3  , 432  ,  3  , 1 
4  , 123  ,  2  , 2 

我想在總和的基礎查詢前二十名的用戶記錄周1和第2周的最大總

我想要的結果應該是

id  , user_id  , week1score , week2score 
1  , 123  , 2   , 2 
2  , 432  , 3   , 0 

的公式是爲了通過降總和（MAX（week1）+ MAX（week2））

感謝 伊納姆

Answer 1

這樣的事情會做

SELECT t1.user_id, 
     SUM(week1score) AS week1score, 
     SUM(week2score) AS week2score 
FROM (SELECT user_id 
     FROM `table` 
     GROUP BY user_id) AS t1 
     JOIN (SELECT user_id, 
        Max(IF(`week` = 1, score, 0)) AS week1score, 
        Max(IF(`week` = 2, score, 0)) AS week2score 
      FROM `table` 
      GROUP BY user_id, 
         `week`) t2 
     ON t2.user_id = t1.user_id 
GROUP BY user_id 
ORDER BY (SUM(week1score) + SUM(week2score)) DESC 

您需要在下列的組合大指數

• （USER_ID，一週，評分）