题解 | 尊不容易
返回购买 prod_id 为 BR01 的产品的所有顾客的电子邮件（一）
https://www.nowcoder.com/practice/962b16554fbf4b99a87f4d68020c5bfb
select cust_email
from Customers
where cust_id in (select cust_id
from Orders
where order_num in (select order_num
from OrderItems
where prod_id='BR01'))
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