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