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
http://www.nowcoder.com/practice/ae44b2b78525417b8b2fc2075b557592
知识点:case when
select device_id,gender, case when age between 20 and 24 then '20-24岁' when age >=25 then '25岁及以上' else '其他' end as age_cut from user_profile ;