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 age_type,count(*) as age_cnt
from
(select id,
case when age<25 then '25岁以下'
when age>=25 then '25岁及以上'
when age is null then '25岁以下' end
as age_type
from user_profile) a
group by age_type
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