题解 | #得分不小于平均分的最低分#

select
    round(min(score))
from
    exam_record a
    left join examination_info b on a.exam_id = b.exam_id
where
    b.tag = 'SQL'
    and 
    a.score>=
        (select
            round(avg(score))
        from
            exam_record a
            left join examination_info b on a.exam_id = b.exam_id
        where
            tag = 'SQL')