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
select tag, difficulty, round(avg(score), 1) as clip_avg_score from ( select b.tag, b.difficulty, a.score, max(a.score) over () as max_score, min(a.score) over () as min_score from exam_record a join examination_info b on a.exam_id = b.exam_id and b.tag = 'SQL' and b.difficulty = 'hard' ) t where score < max_score and score > min_score group by tag, difficulty