Question

Is there any way to optimize the query below? It requires looking through multiple tables. Thank you in advance for your help it is appreciated. Relevant schema:

CREATE TABLE `variant_bikes` (
  `variant_id` mediumint(8) unsigned NOT NULL DEFAULT '0',
  `bike_id` mediumint(8) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`variant_id`,`bike_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `product_bikes` (
  `product_id` mediumint(8) unsigned NOT NULL DEFAULT '0',
  `bike_id` mediumint(8) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`product_id`,`bike_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `cart_products` (
  `product_id` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`product_id`),
) ENGINE=MyISAM AUTO_INCREMENT=95 DEFAULT CHARSET=utf8;

CREATE TABLE `cart_product_options` (
  `option_id` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
  `product_id` mediumint(8) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`option_id`),
) ENGINE=MyISAM AUTO_INCREMENT=9040 DEFAULT CHARSET=utf8;

CREATE TABLE `cart_product_option_variants` (
  `variant_id` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
  `option_id` mediumint(8) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`variant_id`),
) ENGINE=MyISAM AUTO_INCREMENT=9040 DEFAULT CHARSET=utf8;

And SQL is:

select distinct p.product_id 
from cart_products p 
     left join product_bikes b on p.product_id = b.product_id where bike_id = $bike_id
or
p.product_id in (
    select product_id from cart_product_options where option_id in (
        select option_id from cart_product_option_variants where variant_id in (
            select variant_id from variant_bikes where bike_id=$bike_id
        )
    )
)

Edit: Short is a customer selects a bike and this selects the products which fit, either the product itself or the product option variants. Note this code works I just want to know if there is a way to optimize it.

Answer 1

Though the nature to my question changed a bit the join strategy works, but is it the best answer? i.e. does it resolve my original question of it being optimized as both work:

select distinct p.product_id from cscart_products p 
    left join product_bikes pb on p.product_id = pb.product_id and pb.bike_id = 111
    left join cscart_product_options po on po.product_id = p.product_id
    left join cscart_product_option_variants pov on pov.option_id = po.option_id
    left join variant_bikes vb on vb.variant_id = pov.variant_id and vb.bike_id = 111
    where pb.bike_id = 111 or vb.bike_id = 111

This resulted in no noticeable speed boost however. (sometimes it would return quicker, other times slower probably due to server load at the time).