MySQL架构
product_categories:
id, name
products
id,category_id,name,description
product_offers
id,product_id,name,email
product_offer_negotiations
id,product_offer_id,offer(float),by_user(ENUM-Seller/buyer),status
这是我试过的查询...
select products.*,
product_categories.name as category_name,
COUNT(product_offers.id) AS total_offers,
ROUND( AVG(product_offer_negotiations.offer), 2) AS avg_offer
from products
inner join product_categories on product_categories.id = products.category_id
inner join product_offers on product_offers.product_id = products.id
inner join product_offer_negotiations on product_offer_negotiations.product_offer_id = product_offers.id
and product_offer_negotiations.by_user = ?
group by products.id;
我想从产品表，total_offers和avg_offer产品中获取所有字段（每个offer_id只有协商表中的最高值 - 没有重复）
此查询仅返回产品表的第一行。谢谢你的帮助。