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)-(max(score)+min(score)))/(count(score)-2),1) as clip_avg_score # 计算分数之和减去最大值和最小值然后除以得分数量减去2 from examination_info ei join exam_record er on ei.exam_id = er.exam_id where tag = 'SQL' and difficulty = 'hard' and score is not null # 根据题目要求选择科目SQL,难度hard，并且去除无效试卷（分数为null的）
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