题解 | 牛客的课程订单分析(四)

select a.user_id,first_buy_date,cnt
from(select user_id,min(date) first_buy_date from order_info
where date > '2025-10-15' 
and product_name in('C++','Java','Python')
and status = 'completed'
group by user_id
having count(status) >= 2) a 
join 
(select user_id,count(status) cnt from order_info
where date > '2025-10-15' 
and product_name in('C++','Java','Python')
and status = 'completed'
group by user_id) b 
on a.user_id = b.user_id
order by user_id