题解 | #牛客的课程订单分析(六)#

select  oi.id,is_group_buy,case client_id when 0 then 'None' else name end client_name    
    from order_info oi left join client c on oi.client_id=c.id
    where user_id in(
select user_id
from (
select user_id,count(*) cnt
from order_info oi 
where date>'2025-10-15' and oi.status='completed' 
    and product_name in('C++','Java','Python')
group by user_id having cnt>=2
        ) hh
   ) and date>'2025-10-15' and oi.status='completed' 
   and product_name in('C++','Java','Python')