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 < 25 then "20-24岁"
when age >=25 then "25岁及以上"
else "其他"
end) as age_cnt
from user_profile
