For this table to create 3 unique keys I did the following, in case it helps someone else out.
+----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+----------------+
| id | int(11) | | PRI | NULL | auto_increment |
| hostname | varchar(100) | | | | |
| mac | varchar(100) | | | | |
| ip | varchar(100) | | | | |
| vlan | varchar(100) | | | | |
+----------+--------------+------+-----+---------+----------------+


UPDATE TABLE hosts ADD UNIQUE mac (mac);
UPDATE TABLE hosts ADD UNIQUE hostname (hostname);
UPDATE TABLE hosts ADD UNIQUE ip (ip);

+----------+--------------+------+-----+---------+----------------+
| Field    | Type         | Null | Key | Default | Extra          |
+----------+--------------+------+-----+---------+----------------+
| id       | int(11)      |      | PRI | NULL    | auto_increment |
| hostname | varchar(100) |      | UNI |         |                |
| mac      | varchar(100) |      | UNI |         |                |
| ip       | varchar(100) |      | UNI |         |                |
| vlan     | varchar(100) |      |     |         |                |
+----------+--------------+------+-----+---------+----------------+

Now I have used the following to check if duplicate records exist before updating:

<?php
// Try and update with posted fields form html form
$update = mysql_query("UPDATE hosts SET hostname='$_POST[hostname]', mac='$_POST[mac]', ip='$_POST[ip]', vlan='$_POST[vlan]' WHERE id='$_SESSION[id]'",$db);
$rows = mysql_affected_rows();


// Check results of operation
if($rows == 0) {
  echo "No matching records found";
} else {
  echo "Matching records found"; }

Hope this helps anyone else, and thanks for the tip on MySQL's UNIQUE field, wish I would have known it sooner, I wouldn't be so pissed off from frustration.
Jas


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