將多行組合成一行並放入表中MySQL

Question

對不起，我的英語）我有3張桌子。接下來類型：

表1 - 用戶

-------------------------------- 
| id  | email | password | 
-------------------------------- 
| 1  | 1  | 3  | 
| 2  | 1  | 4  | 
| 3  | 1  | 3  | 
| 4  | 1  | 4  | 
| 5  | 2  | 3  | 
| 6  | 2  | 4  | 
| 7  | 2  | 3  | 
| 8  | 2  | 4  | 
-------------------------------- 

表2：分數

--------------------------- 
id  | idUser | nameScore| 
-------------------------------- 
| 1  | 1  | df  | 
| 2  | 1  | sa  | 
| 3  | 1  | as  | 
| 4  | 1  | 4  | 
| 5  | 2  | 3  | 
| 6  | 2  | 4  | 
| 7  | 2  | 3  | 
| 8  | 2  | 4  | 
-------------------------------| 

表3：支付

-------------------------------------------------- 
| id  | idScorePayer |idScorePayee| money 
-------------------------------------------------- 
| 1  | 1    | 2  | 1000 
| 2  | 2    | 4  | 700 
| 3  | 3    | 1  | 1500 
| 4  | 4    | 3  | 9000 
--------------------------------------------------- 

我試着去輸出什麼：

----------------------------------------------- 
| id  | emailPayer | emailPayee  | money 
----------------------------------------------- 
| 1  | yellow@  | cookies@  | 
| 2  | yellow@  | milk@   | 
| 3  | yellow@  | cookies@  | 
| 4  | yellow@  | milk@   | 
| 5  | blue@  | cookies@  | 
| 6  | blue@  | milk@   | 
| 7  | blue@  | cookies@  | 
| 8  | blue@  | milk@   | 
----------------------------------------------- 

Answer 1

下面的查詢應該工作：

select u1.email as emailPayer, u2.email as emailPayee, amount 
from users u1 join scores s1 on u1.id = s1.idUser 
join payment on s1.id = payment.idScorePayer 
join scores s2 on payment.idScorePayee = s2.idUser 
join users u2 on u2.id = s2.idUser 

Answer 2

我沒有MySQL實例再次進行測試，我上的電子郵件表的猜測，但我認爲這會是這樣的：

SELECT 
    users.id, 
    email1.email_name "emailPayer", 
    email2.email_addr "emailPayee", 
    payment.money 
FROM 
    users 
    JOIN scores ON (users.id = scores.idUser) 
    JOIN payment ON (scores.id = payment.idScorePayer) 
    JOIN email email1 ON (scores.idScorePayer = email.id) 
    JOIN email email2 ON (scores.idSCorePayee = email.id)