题解 | #计算总和#
计算总和
https://www.nowcoder.com/practice/d8a624021183454586da94d280cc8046
我第一次是(item_price * sum(quantity)) as 'total_price'这样写的。因为是a1的总价*价格。但是sql不允许这样写，我还是有点糊涂没想明白为啥不是这样
select
order_num,
sum(item_price * quantity) as 'total_price'
from
OrderItems
group by
order_num
having
total_price>=1000
order by
order_num
