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' when age >=25 then '25岁及以上' end as age_cut,count(*) as number FROM user_profile GROUP BY age_cut
case when <condition> then <result>
when <condition> then <result> end
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