Method getDiscountCatsById

public static function getDiscountCatsById($discounId, $select = 0)
{
    $db = Factory::getDBO();
    if ($select == 1) {
        $query = 'SELECT di.discount_id';
    } else {
        $query = 'SELECT c.id as value, c.title as text';
    }
    $query .= ' FROM #__phocacart_categories AS c' . ' LEFT JOIN #__phocacart_discount_categories AS di ON c.id = di.category_id' . ' WHERE di.discount_id = ' . (int) $discounId;
    $db->setQuery($query);
    if ($select == 1) {
        $coupon = $db->loadColumn();
    } else {
        $coupon = $db->loadObjectList();
    }
    return $coupon;
}