Codice PHP:
$host = "localhost";
$user = "root";
$password = "";
$database = "calcolo";
mysql_pconnect($host, $user, $password);
mysql_select_db($database);
$query = "SELECT * FROM prova ORDER BY id DESC";
$result= mysql_query($query) or die("Query Fallita!");
$somma = 0;
while ($row=mysql_fetch_array($result))
$somma += $row['numero1'] + $row['numero2']; ;
echo ($somma);