题解 | 78#牛客的课程订单分析(二)#

select user_id
from order_info  
where date>'2025-10-15' and status='completed' and product_name in ('C++','Python','Java')
group by user_id having count(user_id)>=2
order by user_id

思路：和80题差不多，思路一模一样，就查询的字段少一点。