题解 | #每个题目和每份试卷被作答的人数和次数#
每个题目和每份试卷被作答的人数和次数
https://www.nowcoder.com/practice/203d0aed8928429a8978185d9a03babc
(select exam_id tid,count(distinct uid) uv,count(exam_id) pv from exam_record group by exam_id order by uv desc,pv desc) union (select question_id,count(distinct uid) uv,count(question_id) pv from practice_record group by question_id order by uv desc,pv desc) order by left(tid,1) desc,uv desc,pv desc;
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