题解 | 计算25岁以上和以下的用户数量

select '25岁以下' as age_cut, count(device_id) as number 
from user_profile
where age <25 or age is null

union all 

select '25岁及以上' as age_cut, count(device_id) as number 
from user_profile
where age >=25

和上题没啥区别