$sql = "SELECT
			* ,
			(SELECT SUM(value) FROM joblist AS total_value GROUP BY customer AS) V_value,
			(SELECT SUM(balance) FROM joblist AS total_balance GROUP BY customer) AS B_value,
		FROM joblist
		WHERE customer = :customer" ;

    $customer = $_POST['customer'];
    $statement = $connection->prepare($sql);
    $statement->bindParam(':customer', $customer, PDO::PARAM_STR);
    $statement->execute();
    $result = $statement->fetchAll() ;