Mysql选择总计和名称

Question

列出客户的名字，姓氏和花费的总金额（注意：花费的金额是订单小计+税金+从tblorder表中发货的成本）。

我有这段代码（但价值都是一样的：

Select CONCAT(firstname, ' ' ,lastname) as name, sum(ordersubtotal + ordertax + ordershipcost) as AmountSpent
From tblorder,tblcust
group by name

Answer 1

这应该这样做：

Select CONCAT(firstname, ' ' ,lastname) as name, sum(ordersubtotal + ordertax + ordershipcost) as AmountSpent
From tblorder a
inner join tblcust b ON a.custId=b.custId
group by name;

你没有定义你加入桌子的内容。

在您的代码风格中：

Select CONCAT(firstname, ' ' ,lastname) as name, sum(ordersubtotal + ordertax + ordershipcost) as AmountSpent
From tblorder a,tblcust b
where a.custId=b.custId
group by name;

（两者都应该给出相同的结果）