题解 | #有取消订单记录的司机平均评分#

select ifnull(driver_id, "总体"), round(avg(grade),1) avg_grade
from tb_get_car_order tgo
where driver_id in (
select distinct driver_id
from tb_get_car_order tgo
where start_time is null
    and date_format(order_time, "%Y-%m") ='2021-10')
group by driver_id
with rollup;