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FDMemTable2.First;
  while  not FDMemTable2.Eof do
  begin
    if not FDMemTable1.Locate('F_AUTOID',FDMemTable2.FieldByName('F_AUTOID').AsString,[] ) then
       FDMemTable1.CopyRecord(FDMemTable2);
    FDMemTable2.Next;
  end;

1

FDMEMTABLE.AppendData(FDMEMTABLE.DATA);