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 + 条件，then + 返回语句
when age >= 20 and age <= 24 then "20-24岁"
when age > 24 then "25岁及以上"
else "其他"
end as age_cut # end 结束 case 语句
from user_profile;
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