$query = $db->prepare('INSERT INTO employees (first_name, second_name, middle_name, id_position)
VALUES (:first_name, :second_name, :middle_name, :id_position');
$query->execute(
[
':first_name' => $f_name,
':second_name' => $s_name,
':middle_name' => $m_name,
':id_position' => $position
]);