题解 | #计算25岁以上和以下的用户数量#

select age_cut, count(age_cut) as "number"
from (select (case when age >= 25 then '25岁及以上' when age < 25 || age is null then '25岁以下' end) as "age_cut"
      from user_profile) a
group by age_cut;