题解 | #牛客的课程订单分析(四)#
牛客的课程订单分析(四)
http://www.nowcoder.com/practice/c93d2079282f4943a3771ca6fd081c23
select user_id, min(date) as first_buy_time, count(user_id) as cnt from order_info o where product_name in ('C++','Python','Java') and date > '2025-10-15' and status = 'completed' group by user_id having count(user_id) >= 2 order by user_id
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