题解 | #SQL类别高难度试卷得分的截断平均值#
SQL类别高难度试卷得分的截断平均值
https://www.nowcoder.com/practice/a690f76a718242fd80757115d305be45
with a as
(select ei.tag, ei.difficulty,er.score
from exam_record er
inner join examination_info ei on ei.exam_id =er.exam_id
where ei.tag='SQL'
and er.score is not null and ei.difficulty='hard')
select tag,difficulty,round(avg(score),1) clip_avg_score from a
where a.score<> (select max(score) from a)
and a.score<> (select min(score) from a)
group by 1,2
