ui->tableView->hideColumn(1);

to hide the columns which i didn't need of. Thanks by the way for your response.

• Replace the QTableWidget with a QTableView
• use the code below:

QSqlTableModel* model = new QSqlTableModel(this);
model->setTable(QStringLiteral("cuttorderTable"));
model->setFilter(QStringLiteral("flag = '1'"));
model->select();
ui->tableView->setModel(model);

P.S.

qDebug() << "Hi thread2";

The ui can only be changed by the ui thread and databases can be used only in the thread that created them so be very careful if you are using multiple threads

QSqlQuery q;
    q.prepare("SELECT * FROM cuttorderTable WHERE flag = '1' ");
    q.exec();
    while (q.next())
    {
     qDebug() << "Hi thread2";

       QString sn = q.value(0).toString();
        qDebug() << "sn" << sn;
         QString i1 = q.value(1).toString();
          qDebug() << "SEASONCODE" << i1;
           QString mn = q.value(2).toString();
            qDebug() << "RYOTNUMBER" << mn;
             QString j = q.value(3).toString();
              qDebug() << "VILLAGECODE" << j;
             QString k = q.value(4).toString();
              qDebug() << "OFFICERCODE" << k;
                QString l = q.value(5).toString();
                 qDebug() << "DATE" << l;
                 QString m = q.value(6).toString();
                  qDebug() << "TIME" << m;
                  QString n = q.value(7).toString();
                   qDebug() << "OFFICERNAME" << n;
                  QString o = q.value(8).toString();
                   qDebug() << "PLOTNUMBER" << o;
                   QString p = q.value(9).toString();
                    qDebug() << "CUTTINGORDERCODE" << p;
                    QString t = q.value(10).toString();
                     qDebug() << "GANGLEADERCODE" << t;
                     QString u = q.value(11).toString();
                      qDebug() << "TRANSPORTERCODE" << u;
                      QString v = q.value(12).toString();
                       qDebug() << "MODEOFTRANSPORT" << v;
                       QString w = q.value(13).toString();
                        qDebug() << "CROPTYPE" << w;
                        QString a = q.value(14).toString();
                         qDebug() << "COB" << a;

            
                          QTableWidgetItem *mn1 = new QTableWidgetItem(tr("%1").arg(
                           (0+1)*(0+1)));
                          ui->tableWidget->setItem(0, 0, mn1);

                          QTableWidgetItem *o1 = new QTableWidgetItem(tr("%1").arg(
                           (0+1)*(1+1)));
                          ui->tableWidget->setItem(0, 1, o1);

                          QTableWidgetItem *a1 = new QTableWidgetItem(tr("%1").arg(
                           (0+1)*(2+1)));
                          ui->tableWidget->setItem(0, 2, a1);

}

QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(
(row+1)*(column+1)));
tableWidget->setItem(row, column, newItem);