题解 | 查看不同年龄段的用户明细

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'
end as age_cut
from user_profile

这样也可以，要留意between的拼写