Question

我正在做家庭作业银行数据库。

我有两个表：“帐户”和“交易”。帐户包含客户的名称，姓氏和acc.number。交易持有货币来源的账号，日期（rrrr-mm-dd）和金额。我需要找到一个当月转账金额最大的客户。

我试过

Account inner join (select acc_number, sum(Ammount) as Total from Transactions group by Acc.number order by Total) on Account.acc_number=Transactions.acc_number;

但它没有用。请帮忙。

Answer 1

您缺少＆＃34;选择字段＆＃34;来自您的查询。我认为这个查询应该做你想要实现的目标。

SELECT SUM(Ammount),Account.acc_number from Account 
INNER JOIN Transactions ON Account.acc_number=Transactions.acc_number 
WHERE MONTH(date) = MONTH(CURDATE()) AND YEAR(date) = YEAR(CURDATE()) 
GROUP BY Account.acc_number 
ORDER BY SUM(Amount) DESC 
LIMIT 1

mySQL如何在不同的表中通过max sum查找名称

1 个答案: