题解 | #返回购买价格为 10 美元或以上产品的顾客列表#

# 查询购买价格>=10的订单
select order_num
from OrderItems
where item_price>=10
# 查询该订单的顾客号
select cust_id
from Orders
where order_num in(
    select order_num
    from OrderItems
    where item_price>=10
);