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
) as age_group,
count(customer_id) as user_count
from customers_info
group by age_group
