-- 链接 LINK: https://www.nowcoder.com/practice/dcc4adafd0fe41b5b2fc03ad6a4ac686?tpId=268&tqId=2294894&ru=/practice/dcc4adafd0fe41b5b2fc03ad6a4ac686&qru=/ta/sql-factory-interview/question-ranking
-- 标题 TITLE: SQL21 每个城市中评分最高的司机信息
-- 日期 DATE: 2022-02-15 11:41:16

-- 题解 SQL
SELECT city, driver_id, avg_grade, avg_order_num, avg_mileage
FROM (
    SELECT T1.city, T2.driver_id, 
            ROUND(AVG(T2.grade), 1) avg_grade, 
            ROUND(COUNT(T2.order_id)/COUNT(DISTINCT DATe_FORMAT(T2.order_time, '%Y-%m-%d')), 1)  avg_order_num,
            ROUND(SUM(T2.mileage)/COUNT(DISTINCT DATe_FORMAT(T2.order_time, '%Y-%m-%d')), 3)  avg_mileage,
            MAX(ROUND(AVG(T2.grade), 1)) OVER(PARTITION BY T1.city) max_avg_grade
    FROM tb_get_car_record T1
    INNER JOIN tb_get_car_order T2 ON T2.order_id = T1.order_id
    GROUP BY T1.city, T2.driver_id
) TMP
WHERE avg_grade = max_avg_grade
ORDER BY avg_order_num
;


-- 数据 DATA ===================================================
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, '天津', '2021-10-02 21:00:00', '2021-10-02 21:01:00', 9008),
(109, '天津', '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, 4),
(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, 204, '2021-10-02 21:01:00', '2021-10-02 21:10:00', '2021-10-02 21:31:00', 13.2, 38, 4),
(9009, 109, 204, '2021-10-08 18:01:00', null, '2021-10-08 18:51:00', null, null, null);