select
    device_id,
    gender,
    case
        when age < 20 then '20岁以下'
        when age between 20 and 24 then '20-24岁'
        when age >= 25 then '25岁及以上'
        when age is null then '其他'
        else '其他'
    end as age_cut
from user_profile up;