题解 | #分群并计算群体人数#
分群并计算群体人数
https://www.nowcoder.com/practice/24319fd5c03e482c935783107114933d
select
case
when age < 20 then '20以下'
when age between 20 and 50 then '20-50'
when age > 50 then '50以上'
else '未填写'
end age_group,
count(customer_id) as user_count
from
customers_info
group by
age_group
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