题解 | #牛客的课程订单分析(四)#

SELECT user_id, min(date) as first_buy_date, COUNT(*) as cnt
FROM order_info as info
where date > '2025-10-15' and status = 'completed'
and product_name in ('C++', 'Java', 'Python')
GROUP by user_id
HAVING COUNT(*) >= 2
order by user_id;