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