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