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(id) as number
from user_profile
where age < 25 OR age is null
union
select
"25岁及以上" as age_cut,
count(id) as number
from user_profile
where age >= 25
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