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, '20岁以下' as age_cut from user_profile where age < 20 union all select device_id, gender, '20-24岁' as age_cut from user_profile where age between 20 and 24 union all select device_id, gender, '25岁及以上' as age_cut from user_profile where age >= 25 union all select device_id, gender, '其他' as age_cut from user_profile where age IS NULL order by device_id;
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