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 BETWEEN 20 AND 24 THEN '20-24岁'
WHEN age>=25 THEN '25岁及以上'
ELSE '其他'
END age_cut
FROM user_profile;
//注意数值关系，不用GROUP BY
