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 as tid,count(distinct(uid)) as uv, count(exam_id) as pv from exam_record  group by tid )
union
(select question_id as tid,count(distinct(uid)) as uv,count(question_id) as pv from practice_record group by tid )
order by left(tid,1) desc,uv desc,pv desc

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