Доработать sql - запрос с выборкой из нескольких таблиц

try
        with Unit2.DataModule2.HelpQuery do
          begin
            Active := False;
            SQL.Clear;
            SQL.Add('SELECT b2.number_prik, b3.number_prik, b4.number_prik' +
              ' FROM ((students AS b1' +
              ' LEFT JOIN otchisl AS b2 ON b1.code=b2.code)' +
              ' LEFT JOIN vostan AS b3 ON b1.code=b3.code)' +
              ' LEFT JOIN akadem AS b4 ON b1.code=b4.code' +
              ' WHERE b1.code=''' + DBGridStudents.DataSource.DataSet.FieldByName('code').AsString + '''');
            Active := True;
          end;
      except
      on e:Exception do
      end;

try
        with Unit2.DataModule2.HelpQuery do
          begin
            Active := False;
            SQL.Clear;
            SQL.Add('SELECT b2.number_prik, b2.date_otch,  b3.number_prik, b4.number_prik' +
              ' FROM ((students AS b1' +
              ' LEFT JOIN otchisl AS b2 ON b1.code=b2.code)' +
              ' LEFT JOIN vostan AS b3 ON b1.code=b3.code)' +
              ' LEFT JOIN akadem AS b4 ON b1.code=b4.code' +
              ' WHERE b1.code=''' + DBGridStudents.DataSource.DataSet.FieldByName('code').AsString + '''' +
              ' GROUP BY b1.code,b2.number_prik, b2.date_otch,  b3.number_prik, b4.number_prik');
            Active := True;
          end;
      except
      on e:Exception do
      end;