select if (c.name is NULL, 'GroupBuy', c.name) source, count(*) cnt from ( select *, count(*) over ( partition by user_id ) as ocnt from order_info where date > '2025-10-15' and status = 'completed' and product_name in ('C++', 'Java', 'Python') ) o left join client c on o.client_id = c.id where o...