题解 | #牛客的课程订单分析(三)#
牛客的课程订单分析(三)
http://www.nowcoder.com/practice/4ae8cff2505f4d7cb68fb0ec7cf80c57
select t.id,t.user_id,t.product_name,t.status,t.client_id,t.date
from
(select , count() over(partition by user_id) as num
from order_info
where product_name in ('C++','Java','Python')
and status='completed'
and date >'2025-10-15')t
where t.num>=2
order by t.id
开窗函数解法，group by 会将order_info.id去重。
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