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题解 | #有取消订单记录的司机平均评分#
select coalesce(driver_id,"总体") ,round(avg(grade),1) from (select driver_id from tb_get_car_record tr join ...
Mysql
2022-09-23
0
148
题解 | #统计每个用户的平均刷题数#
select university,difficult_level,count(difficult_level) / count(distinct a.device_id) from (select device_id,question_practice_detail.question_id...
Mysql
2022-04-04
0
273