题解 | #确定哪些订单购买了 prod_id #
确定哪些订单购买了 prod_id 为 BR01 的产品(二)
https://www.nowcoder.com/practice/999aa31a9a504c60baa088d90d82e64d
select cust_id, order_date from Orders o join OrderItems oit on o.order_num = oit.order_num where oit.prod_id = 'BR01' order by o.order_date;
MySQL优化中提到,尽量不使用嵌套查询,而是使用联结(连接)查询

查看3道真题和解析