Here is the story: The application I am working on needs information stored in three tables of a normalized relational database. The information has to be displayed in one QTableView since that would be the "natural view" onto the data. In sql speak its a simple equi join as in
Qt Code: 
  1. select * from A, B, C where A.b=B.id AND A.c=C.id
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The app needs to be able to create, update and delete rows in/from the three tables and display the results in the QTableView. Coming from web apps, I thought this would be a pretty easy one, but I can't figure out how to do it in qt.

The qt examples use a QSqlRelationalTableModel in combination with a QTableView. Foreign keys in main table A are resolved using e.g.
Qt Code: 
  1. model->setRelation(2, QSqlRelation("city", "id", "name"));
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Is it possible to resolve foreign keys to more than one field/column in the model? I need more information from table B and C than just replacing the id columns in table A by one value from table B or C.

I have searched the web and read threads aiming at basically the same topic. Those threads were either not answered or answered by proposing to implement a custom model - is there no other way to solve it?

The examples I have found so far on how to implement a custom model are - let's say "basic" - do you know a good web resource to start from? I have read and implemented half of a Custom Model but the result is awkward. I have read and implemented a MasterDetail Form but was not quite happy with the result since it splits the display into multiple QTableViews. I have read the documentation on QSqlRelationalTableModel and experimented with it.

Bare in mind I am new to qt and probably miss one or more obvious things. So, all suggestions are welcome! Thank you in advance for your help and time!
Nele