IBM's Learning PHP Part 1 tutorial.

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Newbie question.

I'm working my way through IBM's PHP tutorial. Generally good ... but I'm stuck at an error point and have no idea what's going wrong. Before adding a new row to the mysql database (already opened) we do a query to see if a particular record already exists.
(see $resultT).

We then test, using if, to see if $resultT is true or false. If it's false we are then supposed to enter a new record. Problem: it's never false. It always evaluates true. What am I doing wrong? TIA

/*   build query to see if the record is entered already */
    $sqlT = "select * from users where username='".$_POST["name"]."'";
    $resultT = mysql_query($sqlT);

/*   Now test -- did we find anything ... if not add this user */
    if (! $resultT) {
/*  here we add the new record if it doesn't already exit /*

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