Prova cosi..Codice PHP:
$gol = $_POST['gol'];
$db = mysql_connect($host, $dbuser, $dbpass) or die('error could not connect to' . $host);
$db = mysql_select_db($dbname) or die ('error could not connect to' . $dbname . 'Name');
$sql= "UPDATE Table1 SET GOL = '$gol' WHERE Squadre = 'Squadra1'";
mysql_query($sql, $db);