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((sum(score)-min(score)-max(score))/(count(score)-2),1) as clip_avg_score
from
exam_record join examination_info
on examination_info.exam_id=exam_record.exam_id
where score is not null and tag='SQL' and difficulty='hard'
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