题解 | #返回顾客名称和相关订单号以及每个订单的总价#

select
    t3.cust_name as cust_name,
    t1.order_num as order_num,
    sum(quantity * item_price) as OrderTotal
from
    OrderItems as t1
    inner join Orders as t2 on t1.order_num = t2.order_num
    inner join Customers as t3 on t2.cust_id = t3.cust_id
group by cust_name, order_num
order by t3.cust_name asc;