题解 | SQL必知必会93
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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