题解 | 返回顾客名称和相关订单号以及每个订单的总价
返回顾客名称和相关订单号以及每个订单的总价
https://www.nowcoder.com/practice/4dda66e385c443d8a11570a70807d250
select cust_name,a.order_num,sum(quantity*item_price) as OrderTotal from OrderItems a left join Orders b using(order_num) left join Customers c using(cust_id) group by cust_name,a.order_num order by cust_name,a.order_num
三表关联，按照客户姓名和订单名聚合，使用sum对每个小订单额（数量*价格）求和
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