Doesn't seem normal to me:
Qt Code: 
  1. #include <QtGui>
  2. #include <QtSql>
  3. #include <QDebug>
  4. #include "connection.h"
  5.  
  6. class MyTableView: public  QTableView
  7. {
  8.     Q_OBJECT
  9. public:
  10.     MyTableView(): QTableView() {}
  11. public slots:
  12.     void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
  13.     { qDebug() << "dataChanged" << topLeft << bottomRight; }
  14. };
  15.  
  16. int main(int argc, char *argv[])
  17. {
  18.     QApplication app(argc, argv);
  19.  
  20.     if (!createConnection())
  21.         return 1;
  22.  
  24.     model.setTable("person");
  25.     model.setEditStrategy(QSqlTableModel::OnFieldChange);
  26.     model.select();
  27.     MyTableView t1;
  28.     t1.setWindowTitle("View 1");
  29.     t1.setModel(&model);
  30.     QObject::connect(&model, 
  31.         SIGNAL(dataChanged(const QModelIndex&,const QModelIndex&)) ,
  32.         &t1,
  33.         SLOT(dataChanged(const QModelIndex&,const QModelIndex&)));
  34.     MyTableView t2;
  35.     t2.setWindowTitle("View 2");
  36.     t2.setModel(&model);
  37.  
  38.     t1.show();
  39.     t2.show();
  40.     return app.exec();
  41. }
  42. #include "main.moc"
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Changes in View 2 correctly update View 1 using dataChanged()