题解 | #返回购买 有顾客的电子邮件（二）#
返回购买 prod_id 为 BR01 的产品的所有顾客的电子邮件（二）
https://www.nowcoder.com/practice/c7aa73afc41f4dfc925baebdd175c345
select cust_email from Customers inner join Orders on Customers.cust_id = Orders.cust_id inner join OrderItems on OrderItems.order_num = Orders.order_num where prod_id = 'BR01'
出现了莫名其妙的bug，代码一字未动，一次不通过，一次可通过
