题解 | 牛客的课程订单分析(四)
select user_id,min(date) as first_buy_date,count(id) as cnt
from order_info
where date > '2025-10-15'
and product_name in ('C++','Java','Python')
and status = 'completed'
group by user_id
having count(id) >=2
order by user_id;