按照题目要求限制字段，然后按照user_id分组，限制每组数量大于等于2，最后根据user_id排序

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