题解 | 统计每个学校各难度的用户平均刷题数
统计每个学校各难度的用户平均刷题数
https://www.nowcoder.com/practice/5400df085a034f88b2e17941ab338ee8
select university,difficult_level,round(count(qpd.question_id)/count(distinct qpd.device_id) ,4) as avg_answer_cnt
from user_profile as up
join question_practice_detail as qpd
on up.device_id = qpd.device_id
join question_detail as qd
on qpd.question_id= qd.question_id
group by university,difficult_level
;
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