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"
else "其他"
end as age_cut
from
user_profile
考察 case when 多条件
case
when ... then...
when ... then..
else ... end as ..
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