题解 | 计算25岁以上和以下的用户数量
计算25岁以上和以下的用户数量
https://www.nowcoder.com/practice/30f9f470390a4a8a8dd3b8e1f8c7a9fa
select case when age<25 or age is null then "25岁以下"
else "25岁及以上"
end as age_cut,count(*) as number
from user_profile
group by age_cut