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

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听说改名就会有offer:可能是实习上着班想到后面还要回学校给导师做牛马,看着身边都是21-25的年纪,突然emo了了
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