Sql查询难以求和

Question

我有一张表Customers ( id | name )，其名称和名称为fornitori， 和另一张表Money (id | idcustomers | give | have )。

Give和have是int字段，客户提供的资金和金额可以创造余额。

我想创建一个查询，为每个客户显示名称和不同 其中SUM(GIVE) - SUM(HAVE)

的money.idcustomers = customers.id

Answer 1

按客户ID分组应该可以解决问题：

SELECT Customers.name, SUM(GIVE) - SUM(HAVE) total
FROM Customers
JOIN Money ON Money.idcustomers = Customers.id
GROUP BY Customers.id

SQL小提琴演示; http://sqlfiddle.com/#!2/339032/2

Answer 2

SELECT C.name, (SUM(M.give)-SUM(M.Have)) AS total
FROM Customors C, Money M
WHERE C.id = M.idcustomers
ORDER BY C.name
GROUP BY C.name