For2for

 for (int i=0; i <= count; i++)
 {
  ui.twAuto->setVerticalHeaderItem(i, new QTableWidgetItem(query.value(0).toString()));
  ui.twAuto->setItem(i, 0, new QTableWidgetItem(query.value(4).toString()));
  ui.twAuto->setItem(i, 1, new QTableWidgetItem(query.value(5).toString()));
  ui.twAuto->setItem(i, 2, new QTableWidgetItem(query.value(6).toString()));
  ui.twAuto->setItem(i, 3, new QTableWidgetItem(query.value(7).toString()));
  ui.twAuto->setItem(i, 4, new QTableWidgetItem(query.value(8).toString()));
  firm = query.value(1).toString();
  int count2 =  ui.cbFirm->count();
  bool flag = false;
  int k=0;
  for (int index = 0; index <= count2; index++);
   {
    QMessageBox::critical(0, "", QString::number(k));
    if (firm == ui.cbFirm->itemText(k)) 
     {
      flag = true;
     }
    k++;
   }
  if (flag == false) 
  { 
    ui.cbFirm->addItem(firm); 
  }
  query.next();
 }