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
http://www.nowcoder.com/practice/30f9f470390a4a8a8dd3b8e1f8c7a9fa
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 ;
⑨✌们拿它练练面试愣是给他整出幻觉了