题解 | 出现三次以上相同积分的情况
select distinct number from grade
where number in (
select number from grade
group by number
having count(number) >= 3
order by number
)
order by number;
select distinct number from grade
where number in (
select number from grade
group by number
having count(number) >= 3
order by number
)
order by number;
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