使用rand（）使用各种连接和顺序优化mysql查询

Question

我的网站出现问题，所以我查看了mysql慢查询日志。

修复了一些索引，并且在没有连接的情况下查询，现在服务器负载降低，运行正常。

我仍然有一个我无法解决的问题，如果你们有任何提示，我可以做得更好，我会很感激。

这是查询

SELECT p.product_id,
          p.product_offer_price,
          ps.subcategory_name,
          pb.brand_name,
          pm.model_name,
          pm.display_name,
          pm.year_from,
          pm.year_to 
        FROM product p
        INNER JOIN product_subcategory ps ON ps.subcategory_id = p.product_subcategory_id AND ps.subcategory_category_id = 12
        INNER JOIN product_stock pq ON pq.product_id = p.product_id AND pq.product_quantity > 0
        INNER JOIN product_photos pp ON pp.product_id = p.product_id
        INNER JOIN product_brand pb ON pb.brand_id = p.product_brand_id
        INNER JOIN product_model pm ON pm.model_id = p.product_model_id
        GROUP BY p.product_id
        ORDER BY RAND() LIMIT 4;

这是关于查询的解释

我试图完成这样的事情，但是没有工作

SELECT p.product_id, p.product_offer_price, ps.subcategory_name, pb.brand_name, pm.model_name, pm.display_name, pm.year_from, pm.year_to
FROM product p
INNER JOIN product_subcategory ps ON ps.subcategory_id = p.product_subcategory_id
AND ps.subcategory_category_id =12
INNER JOIN product_stock pq ON pq.product_id = p.product_id
AND pq.product_quantity >0
INNER JOIN product_photos pp ON pp.product_id = p.product_id
INNER JOIN product_brand pb ON pb.brand_id = p.product_brand_id
INNER JOIN product_model pm ON pm.model_id = p.product_model_id
WHERE p.product_id >= FLOOR( 1 + RAND( ) * (
SELECT MAX( product_id )
FROM product ) )
GROUP BY p.product_id
LIMIT 4