题解 | #查看不同年龄段的用户明细#
查看不同年龄段的用户明细
https://www.nowcoder.com/practice/ae44b2b78525417b8b2fc2075b557592
select device_id, gender, case when age<20 then'20岁以下' when age<24 then '20-24岁' when age is null then '其他' else '25岁及以上' end as age_cut from user_profile