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 <= 24 and age >= 20 then '20-24岁'
when age >= 25 then '25岁及以上'
else '其他'
end as age_cut
from user_profile

if(age>20, ' ', ' ') case when age > 20 then ' ' else ' ' end