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mysql_query("UPDATE user SET Alter='$alter_e', Passwort='$pw', email='$email_e' WHERE Nick = '".$_SESSION["user"]."'");

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mysql_query("UPDATE user SET Passwort='$pw', email='$email_e' WHERE Nick = '".$_SESSION["user"]."'");

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function do_query($query,$ressource_id){
  if(mysql_query($query,$ressource_id)){
    return true;
  } else {
    echo "<hr>".mysql_errno().":".mysql_error()."<hr>";
    exit;
  }
}

do_query("UPDATE..");

1:

SET `Alter` = 'Wert'