题解 | #牛客的课程订单分析(七)#
牛客的课程订单分析(七)
http://www.nowcoder.com/practice/d6f4a37f966145da8900ba9edcc4c068
select ifnull(c.name,'GroupBuy') source,count(*) cnt
from (select *,count(*) over(partition by user_id) as cnt
from order_info
where date > '2025-10-15' and product_name in ('Java','C++','Python')and status = 'completed') as t
left join client c
on c.id = t.client_id
where t.cnt>=2
group by source
order by source 
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