题解 | #确定哪些订单购买了 prod_id 为 BR01 的产品（一）#
确定哪些订单购买了 prod_id 为 BR01 的产品（一）
http://www.nowcoder.com/practice/b692b0174c0444fa9452aee2d082fbbb
使用exists代替in select cust_id,order_date from Orders O1 where exists ( select order_num from OrderItems O2 where prod_id = 'BR01' AND O1.order_num = O2.order_num )
