內部連接總和SQL

Question

我一直在嘗試做一個SUM與內部連接，但它顯示每個單元格而不是將它們添加在一起，並只顯示在一個單元格中，我在哪裏出錯？

SELECT SUM(trans) as 'Transactions',city as 'city' 
FROM account 
INNER JOIN branch 
ON branch.bID 
GROUP BY account.trans, branch.city; 

Answer 1

單獨添加branch.city使用下面的查詢，將每個城市返回總和

SELECT SUM(trans) as 'Transactions', branch.city as 'city' 
FROM account 
INNER JOIN branch 
ON branch.bID = account.bID 
GROUP BY branch.city; 

Answer 2

在Group by刪除account.trans。由於您在group by中添加了account.trans, branch.city，因此它會顯示sum(trans)每trans和city。

如果你想sum(trans)每city然後在group by

SELECT SUM(trans) as 'Transactions' 
FROM account 
INNER JOIN branch 
ON branch.bID 
Group by branch.city;