题解 | #返回购买 prod_id 为 BR01 的产品的所有顾客的电子邮件（二）#
返回购买 prod_id 为 BR01 的产品的所有顾客的电子邮件（二）
http://www.nowcoder.com/practice/c7aa73afc41f4dfc925baebdd175c345
select cust_email from Orders
inner join OrderItems using(order_num)
inner join Customers using(cust_id)
where prod_id='BR01';
select cust_email from Customers
inner join Orders using(cust_id)
inner join OrderItems using(order_num)
where prod_id='BR01';