题解 | 返回购买 prod_id 为 BR01 的产品的所有顾客的电子邮件(一)
select cust_email from OrderItems ori join Orders ord on ori.order_num = ord.order_num join Customers cus on ord.cust_id = cus.cust_id where prod_id = 'BR01'
select cust_email from OrderItems ori join Orders ord on ori.order_num = ord.order_num join Customers cus on ord.cust_id = cus.cust_id where prod_id = 'BR01'
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