mysql query if empty

[gwolff2005]

Hi guys I need your help.

I need a code saying. If row "x", "y", "z" of table "user" in database" "guntmar"  is empty display the following text "is empty" otherwise display the content as a graph.. How can i do that?

[runnerjp]

<?php
$sql = "Select foo FROM bar";
$postsresult = mysql_query($sql) or die("Could not get threads");
$num = mysql_num_rows($postsresult);
if($num < 1){echo 'is empty';}else{ echo 'show graph';} ?>