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
http://www.nowcoder.com/practice/a690f76a718242fd80757115d305be45
select
ei.tag,
ei.difficulty,
round(
(sum(er.score) - min(er.score) - max(er.score)) / (count(*) - 2),
1
)
from
exam_record er
inner join examination_info ei on er.exam_id = ei.exam_id
where
ei.difficulty = "hard"
and ei.tag = "SQL"
and er.score is not null
group by
ei.tag,
ei.difficulty
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