1.求每个城市每个司机的三个平均数select city, driver_id, round(avg(grade), 1) as avg_grade, round(count(a.order_time) / count(distinct date(order_time)), 1 ) as avg_order_num, round(sum(mileage) / count(distinct date(order_time)), 3) as avg_mileage from tb_get_car_order a left join tb_get_car_record b on a.order_i...