my $sgetpoll = $dbh->prepare('select switch,(select temp from temppoll where switches.switch=temppoll.switch AND temp != 0 order by id desc limit 1) AS temp,placement from switches natural join placements');
my $sgetpoll = $dbh->prepare('select switch,(select temp from temppoll where switches.switch=temppoll.switch AND temp != 0 order by id desc limit 1) AS temp,placement from switches natural join placements');