Query con data

[Manuelandro]

va bene una cosa del genere?

$query = "SELECT UNIX_TIMESTAMP(Accesso) AS Accesso FROM pgu"; 
$result = mysql_query($query, $db); 
$off = mysql_fetch_array($result);

$query = "SELECT * FROM pgu WHERE $off[Accesso] =! NOW()"; 
$result = mysql_query($query, $db); 
$off2 = mysql_fetch_array($result);

$query = "DELETE FROM presenti WHERE Nick='$off2[Nick]'";
$result = mysql_query($query, $db);