Anyway you could do something like
function myBoolToStr(v: boolean): string;
begin
Result := ifthen(v, 'true', 'false');
end;
In this example you could change true and false to whatever you want to.
I'm not sure about your goals but as suggestion I think you maybe should put myquery1.Execute after an else command to get a efficient code, or use Exit; or Abort; after show the error dialog.
I'm not sure if I understood your question (I'm using Google Translator) but you could use something like this https://pt.wikipedia.org/wiki/Quicksort#Pascal too
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end;
Works with Update1.v15.0.3953.35171 version
;-)