I have this sqlqry, icarrelli have the value 0 and the q2 value 64(sum) why the result is 64 and not -64?

                       <?php

$result = mysql_query("SELECT *,iCarrelli-SUM(q2) as total9   FROM articles,inc");  
$row= mysql_fetch_assoc($result);

echo "" . $row['total9'] . "";

?>
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