Is it possible to have a HTML SELECT/OPTION value as NULL using PHP?

Question

The following is a snippet from my HTML form which pulls the options from the table rows accordingly.

What I want to do is have the first option value to be NULL so

Answer 1

that's why Idon't like NULL values in the database at all.
I hope you are having it for a reason.

if ($_POST['location_id'] === '') {
  $location_id = 'NULL';
} else {
  $location_id = "'".$_POST['location_id']."'";
}
$notes = mysql_real_escape_string($_POST['notes']);
$ipid  = mysql_real_escape_string($_POST['ipid']);

$sql="UPDATE addresses 
    SET notes='$notes', location_id=$location_id
    WHERE ipid = '$ipid'";

echo $sql; //to see different queries this code produces
// and difference between NULL and 'NULL' in the query