Joining tables on different databases, while bindingValues

I'm trying to update a table with info from boundValues. Except for the city_id. I need to use the city from the boundValue to get its associated city_id from x

$stmt = $this->db->prepare(
                "
                UPDATE x_addresses
                INNER JOIN x ON x = x...
                SET
                    customer_id = :userId,
                    first_name = :firstname,
                    last_name = :lastname,
                    state = :state,
                    company_name = :company,
                    street1 = :street1,
                    street2 = :street2,
                    postal = :postalCode,
                    country = :country,
                    city = :city,
                    city_id = x,
                    region = :region,
                WHERE customer_id = $id
            "
            );