题解 | #返回每个顾客不同订单的总金额#
返回每个顾客不同订单的总金额
https://www.nowcoder.com/practice/ce313253a81c4947b20e801cd4da7894
select cust_id,sum(item_price*quantity) as total_ordered from OrderItems,Orders where OrderItems.order_num = Orders.order_num group by cust_id order by total_ordered desc
知识点：联结表
//注意一个cust_id可以对应多个order_num group by cust_id //而不是order_num
投递旷视等公司10个岗位 >