题解 | #返回购买 prod_id 为 BR01 的产品的所有顾客的电子邮件（一）#
返回购买 prod_id 为 BR01 的产品的所有顾客的电子邮件（一）
http://www.nowcoder.com/practice/962b16554fbf4b99a87f4d68020c5bfb
SELECT a.cust_email FROM Customers as a left join Orders as b on a.cust_id = b.cust_id left join OrderItems as c on b.order_num = c.order_num WHERE prod_id = 'BR01'
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