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
with t1 as(
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
from customers_info
)
select age_group,count(age_group) user_count
from t1
group by age_group;
