I am going to calculate new row for each result from this subjacent

```cpp
QSqlQueryModel *model = new QSqlQueryModel();
model->setQuery("SELECT height,age from patients", DB->getDB());
model->setHeaderData(4,Qt::Horizontal,tr("height"));
model->setHeaderData(2,Qt::Horizontal,tr("age"));
ui->tableView->setModel(model);    
ui->tableView->show();

```

as 

```
ratio = height/age;

```

can I do it? how?

thank You!