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 my $qry  = "";
 my $name = "Mueller";
...
 if ($name) { $qry .= "::5544$nameGDFT"; }
 if ($plz)  { $qry .= "xxxxx$plz::0:";}
 print $qry;

 if    ($name && $vorname && $plz && $tel && tel49) { $qry = "whatever
+" }
 elsif ($name && $vorname && $plz && $tel)          { $qry = "whatever
+2" }
 elsif ($name && $vorname && $plz)                  { $qry = "whatever
+3" };