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 #注意这里如果是
#count(exam_id)会算出错误结果
from
exam_record as main
join examination_info as b
on b.exam_id = main.exam_id
where tag = 'SQL' and difficulty = 'hard'
group by tag,difficulty
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