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
这道题的关键在于union的排序的使用
select * from (select exam_id as tid, count(distinct uid) as uv, count(1) as pv from exam_record group by exam_id order by uv desc,pv desc ) as ta union all select * from ( select question_id as tid, count(distinct uid) as uv, count(1) as pv from practice_record group by question_id order by uv desc,pv desc) as tb
