题解 | SQL必知必会 T99
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 c.cust_email from Orders o inner join OrderItems oi on o.order_num = oi.order_num inner join Customers c on o.cust_id = c.cust_id where oi.prod_id = 'BR01'
三张表信息最多的是orders,所以把其他两张表连上,然后再娶customers里的emali