Comment Tutorial D has already been done.. Alphora (Score 2) 505
Tutorial D with a truly relational rdbms has already been implemented. The company is Alphora.
The product is Dataphor.
see http://www.alphora.com/
% "Every morning, I get up and look through the 'Forbes' list of the richest people in America. If I'm not there, I go to work" -- Robert Orben
