MySQL SUM從兩個表錯誤的結果

Question

我有兩個表指定錢（價格）SUM的問題。帶有錯誤SUM結果的結果問題。
我的查詢：

SELECT SUM(up2.price + uf1.price) AS TotalCredit 
FROM user_faktorha AS uf1, u_payment AS up2 
WHERE uf1.`acc_id` = '11784' && up2.`Account`='11784' && up2.`Active`='1' 

表user_faktorha列Price有正數和負數。
表u_payment列Price只有正數。

有什麼問題或問題？

Answer 1

我可能會建議你的語法上的些許變化。這裏有兩個備選方案：

SELECT up2.price + uf1.price AS TotalCredit 
FROM user_faktorha AS uf1 
INNER JOIN u_payment AS up2 
    on uf1.acc_id = up2. Account 
WHERE uf1.`acc_id` = '11784' && up2.`Active`='1'; 

或者

SELECT sum(up2.price + uf1.price) AS TotalCredit 
FROM user_faktorha AS uf1 
INNER JOIN u_payment AS up2 
    on uf1.acc_id = up2. Account 
WHERE uf1.`acc_id` = '11784' && up2.`Active`='1' 
GROUP BY uf1.acc_id 

通知的INNER JOIN語法兩個表，他們正在申請的acc_id之間。此外，在第一個版本，我沒有使用聚合函數，我只是將兩個表中的price，而第二個版本使用sum()聚集，並增加了group by

Answer 2

試試這個

 SELECT (up2.price + uf1.price) AS TotalCredit 
     FROM user_faktorha AS uf1, u_payment AS up2 
     WHERE uf1.`acc_id` = '11784' && up2.`Account`='11784' && up2.`Active`='1' 

因爲U將它們添加ü不需要SUM