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
tid,
uv,
pv
from
(
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
) a
union all
select
tid,
uv,
pv
from
(
select
question_id tid,
count(distinct uid) uv,
count(question_id) pv
from
practice_record
group by question_id
order by uv desc,pv desc
) b
