题解 | #统计每个学校的答过题的用户的平均答题数#
统计每个学校的答过题的用户的平均答题数
https://www.nowcoder.com/practice/88aa923a9a674253b861a8fa56bac8e5
select university,round(count(question_id)/count(distinct question_practice_detail.device_id),4) avg_answer_cnt from user_profile join question_practice_detail on question_practice_detail.device_id= user_profile.device_id group by university
答案是抄的别人的,牛客网的题目还是需要多做才知道它的逻辑,好多地方语焉不详或者没说清楚,难道工作环境中就都是这样吗?