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 "25岁以下" as age_cut ,count(*) as number from user_profile where age<25 or age is null union all select "25岁及以上" as age_cut,count(*) as number from user_profile where age>=25
