明细情况,我多看几个字段不行嘛select id,device_id,gender,university,gpa,active_days_within_30,question_cnt,answer_cnt, case when age<20 then '20岁以下' when age in(20,21,22,23,24) then '20-24岁' when age>=25 when '25岁及以上' when age is null then '其他' end as age_cut from user_profile;
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