SQL175 有取消订单记录的司机平均评分
题目描述
现有用户打车记录表tb_get_car_record
id | uid | city | event_time | end_time | order_id |
---|---|---|---|---|---|
1 | 101 | 北京 | 2021-10-01 07:00:00 | 2021-10-01 07:02:00 | NULL |
2 | 102 | 北京 | 2021-10-01 09:00:30 | 2021-10-01 09:01:00 | 9001 |
3 | 101 | 北京 | 2021-10-01 08:28:10 | 2021-10-01 08:30:00 | 9002 |
4 | 103 | 北京 | 2021-10-02 07:59:00 | 2021-10-02 08:01:00 | 9003 |
5 | 104 | 北京 | 2021-10-03 07:59:20 | 2021-10-03 08:01:00 | 9004 |
6 | 105 | 北京 | 2021-10-01 08:00:00 | 2021-10-01 08:02:10 | 9005 |
7 | 106 | 北京 | 2021-10-01 17:58:00 | 2021-10-01 18:01:00 | 9006 |
8 | 107 | 北京 | 2021-10-02 11:00:00 | 2021-10-02 11:01:00 | 9007 |
9 | 108 | 北京 | 2021-10-02 21:00:00 | 2021-10-02 21:01:00 | 9008 |
10 | 109 | 北京 | 2021-10-08 18:00:00 | 2021-10-08 18:01:00 | 9009 |
(uid-用户ID, city-城市, event_time-打车时间, end_time-打车结束时间, order_id-订单号)
打车订单表tb_get_car_order
id | order_id | uid | driver_id | order_time | start_time | finish_time | mileage | fare | grade |
---|---|---|---|---|---|---|---|---|---|
1 | 9002 | 101 | 202 | 2021-10-01 08:30:00 | null | 2021-10-01 08:31:00 | null | null | null |
2 | 9001 | 102 | 202 | 2021-10-01 09:01:00 | 2021-10-01 09:06:00 | 2021-10-01 09:31:00 | 10.0 | 41.5 | 5 |
3 | 9003 | 103 | 202 | 2021-10-02 08:01:00 | 2021-10-02 08:15:00 | 2021-10-02 08:31:00 | 11.0 | 41.5 | 4 |
4 | 9004 | 104 | 202 | 2021-10-03 08:01:00 | 2021-10-03 08:13:00 | 2021-10-03 08:31:00 | 7.5 | 22 | 4 |
5 | 9005 | 105 | 203 | 2021-10-01 08:02:10 | null | 2021-10-01 08:31:00 | null | null | null |
6 | 9006 | 106 | 203 | 2021-10-01 18:01:00 | 2021-10-01 18:09:00 | 2021-10-01 18:31:00 | 8.0 | 25.5 | 5 |
7 | 9007 | 107 | 203 | 2021-10-02 11:01:00 | 2021-10-02 11:07:00 | 2021-10-02 11:31:00 | 9.9 | 30 | 5 |
8 | 9008 | 108 | 203 | 2021-10-02 21:01:00 | 2021-10-02 21:10:00 | 2021-10-02 21:31:00 | 13.2 | 38 | 4 |
9 | 9009 | 109 | 203 | 2021-10-08 18:01:00 | 2021-10-08 18:11:50 | 2021-10-08 18:51:00 | 13 | 40 | 5 |
(order_id-订单号, uid-用户ID, driver_id-司机ID, order_time-接单时间, start_time-开始计费的上车时间, finish_time-订单完成时间, mileage-行驶里程数, fare-费用, grade-评分)
场景逻辑说明:
- 用户提交打车请求后,在用户打车记录表生成一条打车记录,order_id-订单号设为null;
- 当有司机接单时,在打车订单表生成一条订单,填充order_time-接单时间及其左边的字段,start_time-开始计费的上车时间及其右边的字段全部为null,并把order_id-订单号和order_time-接单时间(end_time-打车结束时间)写入打车记录表;若一直无司机接单,超时或中途用户主动取消打车,则记录end_time-打车结束时间。
- 若乘客上车前,乘客或司机点击取消订单,会将打车订单表对应订单的finish_time-订单完成时间填充为取消时间,其余字段设为null。
- 当司机接上乘客时,填充订单表中该start_time-开始计费的上车时间。
- 当订单完成时填充订单完成时间、里程数、费用;评分设为null,在用户给司机打1~5星评价后填充。
问题:请找到2021年10月有过取消订单记录的司机,计算他们每人全部已完成的有评分订单的平均评分及总体平均评分,保留1位小数。先按driver_id升序输出,再输出总体情况。
输出示例:
示例数据的输出结果如下
driver_id | avg_grade |
---|---|
202 | 4.3 |
203 | 4.8 |
总体 | 4.6 |
解释:
2021年国庆有未完成订单的司机有202和203;202的所有订单评分有:5、4、4,平均分为4.3;203的所有订单评分有:5、5、4、5,平均评分为4.8;总体平均评分为(5+4+4+5+5+4+5)/7=4.6
SQL Schema
sql
DROP TABLE IF EXISTS tb_get_car_record,tb_get_car_order;
CREATE TABLE tb_get_car_record
(
id INT PRIMARY KEY AUTO_INCREMENT COMMENT '自增ID',
uid INT NOT NULL COMMENT '用户ID',
city VARCHAR(10) NOT NULL COMMENT '城市',
event_time datetime COMMENT '打车时间',
end_time datetime COMMENT '打车结束时间',
order_id INT COMMENT '订单号'
) CHARACTER SET utf8
COLLATE utf8_bin;
CREATE TABLE tb_get_car_order
(
id INT PRIMARY KEY AUTO_INCREMENT COMMENT '自增ID',
order_id INT NOT NULL COMMENT '订单号',
uid INT NOT NULL COMMENT '用户ID',
driver_id INT NOT NULL COMMENT '司机ID',
order_time datetime COMMENT '接单时间',
start_time datetime COMMENT '开始计费的上车时间',
finish_time datetime COMMENT '订单结束时间',
mileage FLOAT COMMENT '行驶里程数',
fare FLOAT COMMENT '费用',
grade TINYINT COMMENT '评分'
) CHARACTER SET utf8
COLLATE utf8_bin;
INSERT INTO tb_get_car_record(uid, city, event_time, end_time, order_id)
VALUES (101, '北京', '2021-10-01 07:00:00', '2021-10-01 07:02:00', null),
(102, '北京', '2021-10-01 09:00:30', '2021-10-01 09:01:00', 9001),
(101, '北京', '2021-10-01 08:28:10', '2021-10-01 08:30:00', 9002),
(103, '北京', '2021-10-02 07:59:00', '2021-10-02 08:01:00', 9003),
(104, '北京', '2021-10-03 07:59:20', '2021-10-03 08:01:00', 9004),
(105, '北京', '2021-10-01 08:00:00', '2021-10-01 08:02:10', 9005),
(106, '北京', '2021-10-01 17:58:00', '2021-10-01 18:01:00', 9006),
(107, '北京', '2021-10-02 11:00:00', '2021-10-02 11:01:00', 9007),
(108, '北京', '2021-10-02 21:00:00', '2021-10-02 21:01:00', 9008),
(109, '北京', '2021-10-08 18:00:00', '2021-10-08 18:01:00', 9009);
INSERT INTO tb_get_car_order(order_id, uid, driver_id, order_time, start_time, finish_time, mileage, fare, grade)
VALUES (9002, 101, 202, '2021-10-01 08:30:00', null, '2021-10-01 08:31:00', null, null, null),
(9001, 102, 202, '2021-10-01 09:01:00', '2021-10-01 09:06:00', '2021-10-01 09:31:00', 10.0, 41.5, 5),
(9003, 103, 202, '2021-10-02 08:01:00', '2021-10-02 08:15:00', '2021-10-02 08:31:00', 11.0, 41.5, 4),
(9004, 104, 202, '2021-10-03 08:01:00', '2021-10-03 08:13:00', '2021-10-03 08:31:00', 7.5, 22, 4),
(9005, 105, 203, '2021-10-01 08:02:10', null, '2021-10-01 08:31:00', null, null, null),
(9006, 106, 203, '2021-10-01 18:01:00', '2021-10-01 18:09:00', '2021-10-01 18:31:00', 8.0, 25.5, 5),
(9007, 107, 203, '2021-10-02 11:01:00', '2021-10-02 11:07:00', '2021-10-02 11:31:00', 9.9, 30, 5),
(9008, 108, 203, '2021-10-02 21:01:00', '2021-10-02 21:10:00', '2021-10-02 21:31:00', 13.2, 38, 4),
(9009, 109, 203, '2021-10-08 18:01:00', '2021-10-08 18:11:50', '2021-10-08 18:51:00', 13, 40, 5);
答案
Tip
坑点:什么样的司机?2021年10月份有取消订单的司机;什么样的订单?是这些司机所有月份中有评分的订单,不仅仅只是2021年10月份的订单!!!
sql
SELECT IFNULL(driver_id, '总体') AS `driver_id`, ROUND(AVG(grade), 1) AS avg_grade
FROM tb_get_car_order
WHERE driver_id IN (SELECT DISTINCT driver_id
FROM tb_get_car_order
WHERE start_time IS NULL
AND YEAR(finish_time) = 2021
AND MONTH(finish_time) = 10)
AND grade IS NOT NULL
GROUP BY driver_id
WITH ROLLUP;