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select

    device_id,

    gender,

    if(age <20, '20岁以下',

        if(age >=25, '25岁及以上',

            if(age between 20 and 24, '20-24岁', '其他'))) as age_cut

from user_profile

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select

    device_id,

    gender,

    (case

        when age < 20  then '20岁以下'

        when age >= 20 and age <= 24 then '20-24岁'

        when age >= 25 then '25岁及以上'

        else '其他'

    end) as age_cut

from user_profile