public function findAllBySku($sku)
    {

        // initialize the params
        $params = array(MemberNames::SKU => $sku);

        // load and return the URL rewrite product category relations for the passed SKU
        $this->urlRewriteProductCategoriesBySkuStmt->execute($params);
        return $this->urlRewriteProductCategoriesBySkuStmt->fetchAll(\PDO::FETCH_ASSOC);
    }