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
with t1 as (
select a.exam_id, b.score, a.tag, a.difficulty
from examination_info a
left join exam_record b
on a.exam_id = b.exam_id
where tag = 'SQL' and difficulty = 'hard'
)
select tag, difficulty,
round(avg(score),1) as clip_avg_score
from t1
where score not in (
select max(score)
from t1
union all
select min(score)
from t1
)
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