$cth->prepare("SELECT COUNT(*) From Table1 Where.....");
$cth->execute($Server1,$App1,$Inst1,);
if (@rows == "0")
{
  $sth->prepare("SELECT 1");
  $sth->execute($Svr1,$ap1,$in);
}
else
{
  $sth->prepare("SELECT 2")
  $sth->execute($svr1,$ap);
}