描述
表OrderItems代表订单商品信息表,prod_id为产品id;Orders表代表订单表有cust_id代表顾客id和订单日期order_date
OrderItems表
prod_id | order_num |
BR01 | a0001 |
BR01 | a0002 |
BR02 | a0003 |
BR02 | a0013 |
Orders表
order_num | cust_id | order_date |
a0001 | cust10 | 2022-01-01 00:00:00 |
a0002 | cust1 | 2022-01-01 00:01:00 |
a0003 | cust1 | 2022-01-02 00:00:00 |
a0013 | cust2 | 2022-01-01 00:20:00 |
【问题】
编写 SQL 语句,使用子查询来确定哪些订单(在 OrderItems 中)购买了 prod_id 为 "BR01" 的产品,然后从 Orders 表中返回每个产品对应的顾客 ID(cust_id)和订单日期(order_date),按订购日期对结果进行升序排序。
【示例结果】返回顾客id cust_id和定单日期order_date。
cust_id | order_date |
cust10 | 2022-01-01 00:00:00 |
cust1 | 2022-01-01 00:01:00 |
【示例解析】
产品id为"BR01"的订单a0001和a002的下单顾客cust10和cust1的下单时间分别为2022-01-01 00:00:00和2022-01-01 00:01:00
示例1
输入:
DROP TABLE IF EXISTS `OrderItems`;
CREATE TABLE IF NOT EXISTS `OrderItems`(
prod_id VARCHAR(255) NOT NULL COMMENT '产品id',
order_num VARCHAR(255) NOT NULL COMMENT '商品订单号'
);
INSERT `OrderItems` VALUES ('BR01','a0001'),('BR01','a0002'),('BR02','a0003'),('BR02','a0013');
DROP TABLE IF EXISTS `Orders`;
CREATE TABLE IF NOT EXISTS `Orders`(
order_num VARCHAR(255) NOT NULL COMMENT '商品订单号',
cust_id VARCHAR(255) NOT NULL COMMENT '顾客id',
order_date TIMESTAMP NOT NULL COMMENT '下单时间'
);
INSERT `Orders` VALUES ('a0001','cust10','2022-01-01 00:00:00'),('a0002','cust1','2022-01-01 00:01:00'),('a0003','cust1','2022-01-02 00:00:00'),('a0013','cust2','2022-01-01 00:20:00');
复制
输出:
cust10|2022-01-01 00:00:00
cust1|2022-01-01 00:01:00
答案
select t1.cust_id,t1.order_date
from Orders t1,OrderItems t2
where t1.order_num=t2.order_num
and t2.prod_id='BR01'