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
with t as
(select * from order_info where date>'2025-10-15' and status='completed' and product_name in ('C++','Java','Python'))
select ifnull(name,'GroupBuy') source,count() cnt
from (select * from t where user_id in (select user_id from t group by user_id having count()>1)) t1
left join client
on t1.client_id=client.id
group by name
order by source;
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