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) > 1
order by user_id asc;