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 >= 20 and age<=24 THEN '20-24岁'
WHEN age >= 25 then '25岁及以上'
when age IS NULL then '其他'
END age_cut
FROM user_profile
