题解 | #牛客的课程订单分析(四)#

select tmp.user_id, tmp.date, tmp.cnt
from (
    select user_id, date, rank() over(partition by user_id order by date) rankNo, 
count(*) over(partition by user_id) cnt
from order_info
where date>'2025-10-15' and order_info.status = 'completed' 
and order_info.product_name in('C++','Java','Python')
) tmp
where tmp.cnt>1 and rankNo=1
order by tmp.user_id