mysql分组查询结果集作为条件查询的问题

问题：查询对规格商品的价格最小的记录？

表结构：表商品表store_prd，商品价格表：store_prd_price，商品表与价格表示一对多关系

注意：分组查询的结果集作为多条件的关系

sql实现：

SELECT 

  prd.`door_id` doorId,
  prd.`name` prdName,
  prd.`id` prdId,
  prd.`prd_type` prdType,
  prd.`prd_expire_date` prdExpireDate,
  p1.`discount_price` discountPrice,
  p1.`price` costPrice,
  p1.`discount` isDiscount,
  prdPrice.`saleStock` saleCount,
  prd.`discount_type` discountType 
FROM
  `store_prd_price` p1,
  `store_prd` prd,
  (SELECT 
    prd.`id` prdId,
    MIN(price.`discount_price`) AS discountPrice 
  FROM
    `store_prd_price` price,
    `store_prd` prd 
  WHERE prd.`id` = price.`prd_id` 
    AND prd.`is_delete` = 0 
    AND price.`is_delete` = 0 
  GROUP BY prdId) t3,
  (SELECT 
    SUM(priceN.`sale_stock`) saleStock,
    prdN.`id` 
  FROM
    `store_prd` prdN,
    `store_prd_price` priceN 
  WHERE prdN.`id` = priceN.`prd_id` 
  GROUP BY prdN.`id`) prdPrice 
WHERE prd.`id` = p1.`prd_id` 
  and t3.prdId = p1.`prd_id` 
  AND p1.`discount_price` = t3.discountPrice 
GROUP BY prdId 
order by prd.`create_time` desc