题解 | #牛客的课程订单分析(五)#
牛客的课程订单分析(五)
http://www.nowcoder.com/practice/348afda488554ceb922efd2f3effc427
select a.user_id, min(a.date) as first_buy_date,min(a.next_date) as second_buy_date,count(*) as cnt
from
(select
* ,
lead(date,1) over(partition by user_id order by date) as next_date
from order_info
where date>='2025-10-16'
and status='completed'
and product_name in('C++','Java','Python')
) a
group by a.user_id
having count(*)>=2
order by a.user_id ;