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  Delphi(Pascal) code:

procedure TForm1.FormCreate(Sender: TObject);
var
i:Real;
newid:string;
begin
with ADOQuery1 do
begin
Close;
SQL.Clear;
SQL.Add(' select * from JYBB where id like '+''''+FormatDateTime('YYMM',Now())+'%'+'''');
Open;
if ADOQuery1.IsEmpty then
newid:=formatdatetime('YYMM',Now())+'0001'
else
begin
Close;
SQL.Clear;
SQL.Add('select max(id)+1 as i from JYBB where left(id,4)='''+FormatDateTime('YYMM',Now())+'''') ;
Open;
newid:=FormatDateTime('YYMM',Now())+ FormatFloat('000',i);
end;
Edit3.Text:=newid;
end;
end;



FormatFloat('0000',i);


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FormatFloat('0000',i);


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FormatFloat('0000',ADOQuery1.FieldByName('i').asInterger);

FormatFloat('0000',ADOQuery1.FieldByName('i').asInteger);

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showmessage(ADOQuery1.


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