mysql_num_rows()

I'm having a little trouble working with this function. I've come across this problem before, but never found a suitable fix for it.

First of all, here is my very basic code.

	$page = str_replace(" ","-",$_POST['page']);
	$sql = "select * from articles where page = '$page'";
	$result = mysql_query($sql);
	$num = mysql_num_rows($result);
	
	if ($num > 0) {
		$sql = "insert into articles values('', '$page', '" . $_POST['title'] . "', '" . $_POST['content'] . "',)";
		mysql_query($sql);
	} else {
		$sql = "update articles set title = '" . $_POST['title'] . "', content = '" . $_POST['content'] . "' where page = '$page'";
		mysql_query($sql);
	}

PHP:

I don't see any trouble with it, as when there is no matching row $num = 0. I was echoing this just fine. However it does not insert anything into the database, nor are any errors appearing when the code is ran.

Any ideas?

 

Oi vey. Ok, I saw the problem the second I hit "Post". It's a typo in my query to mysql. Damn commas.