题解 | #输出提交次数大于2次的用户ID且倒序排列#

select
    user_id
from
    (
        select
            user_id,
            count(done_time) as ct
        from
            done_questions_record
        group by
            user_id
        having
            ct > 2
    ) as dqr
order by
    user_id desc

竟然是按user_id倒序排列，一开始还以为按提交次数倒序排列