JOIN - INSERT UPDATE и SELECT - JoomShopping

INSERT INTO `#__jshopping_products` SET `prod_category` = '".$db->escape($cat_id)."' WHERE  `product_id` = '".$db->escape($product_id)."'";

    function setCategoryToProduct($product_id, $categories = array()){
        $db = JFactory::getDBO();
        foreach($categories as $cat_id){
            if (!$this->productInCategory($product_id, $cat_id)){
                $ordering = $this->getMaxOrderingInCategory($cat_id)+1;
                $query = "INSERT INTO `#__jshopping_products_to_categories` SET `product_id` = '".$db->escape($product_id)."', `category_id` = '".$db->escape($cat_id)."', `product_ordering` = '".$db->escape($ordering)."'";
                $db->setQuery($query);
                $db->query();
            }
        }

query = "SELECT title1 .... JOIN ... WHERE pole='$title1'"