C.J. Date is an independent author, lecturer, researcher, and, specializing in relational database systems (a field he pioneer). His most recent books are Foundation for Future Systems: The Third Manifesto (2nd edition, co-authored with Darwen); The Database Relational Model: A Retrospective Review Analysis; WHAT Not HOW: The Business Rules Approach to Application; and An Introduction to Database Systems (7th edition), of them published by Addison-Wesley in 2000.
Inheritance and Comparison Operations The effects of polymorphism and substitutability on comparisons October 20, 2000 Covariance and Contravariance Some further implications of substitutability August 18, 2000 Polymorphism and Substitutability A look at the fundamental mechanisms for achieving code reuse February 9, 2000 Type Hierarchies: Beginning An Investigation into Type Inheritance Type hierarchies are an intuitively convenient way of depicting subtype/supertype relationships in an inheritance model November 16,1999 Thirty Years of Relational: Relational Forever! The relational model will stand the test of time June 22, 1999 Thirty Years of Relational: Extending the Relational Model When's an extension not an extension? June 01, 1999 Thirty Years of Relational: Relational Really Is Different An analysis of Codd's contribution to the Great Debate May 11, 1999 Thirty Years of Relational: The First Three Normal Forms, Part 2 A concluding look at Codd's normalization ideas April 20, 1999 Thirty Years of Relational: The First Three Normal Forms The beginnings of relational dependency theory March 30, 1999 Data Sublanguage Alpha, Installment 7 Concluding our brief look at Codd's Alpha language March 09, 1999 Data Sublanguage Alpha A look at Codd's own proposal for a relational language February 16, 1999 Thirty Years of Relational - Codd's Relational Algebra January 05, 1999 The Birth of the Relational Model - Thirty Years of Relational A look back at Codd's original papers and how the relational model has evolved over time in today's leading database systems October 1998 The Birth of the Relational Model, Part 3 of 3 The final word on Codd's first two relational papers December 1998 Continuing our look at Codd's first two relational papers Part 2 of 3 November 1998
