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ou may use Filter and Filtered properties of Table component. But for more difficult queries, you may use OnFilterRecord event of TTable. This example shows, how to show records, where AREA>1500000.

procedure TForm1.Table1FilterRecord(DataSet: TDataSet;
  var Accept: Boolean);
var
  Value: Integer;
begin
  Value:=Table1['Area'];
  Accept:=Value>1500000;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Table1.Filtered:=True;
end;