18 NOVEMBER 2013In Papers, added Hugh Darwen's preliminary proposal for user-defined generic relational operators in Tutorial D.
13 OCTOBER 2013In Documents and Books, added link to Chris Date's new video on Temporal Data, available from O'Reilly.
24 SEPTEMBER 2013Added Chris Date's forthcoming seminar, SQL and The Relational Model, in Cleveland, Ohio October 22-24, 2013.
28 July 2013An interview with Chris Date and Hugh Darwen, "No! to SQL! No! to NoSQL!", in the August 2013 issue of NoCOUG Journal added to the Q&A section.
14 JUNE 2013Chris Date's new book Relational Theory for Computer Professionals now available, as is the video based on that book.
10 JUNE 2013Updated the entry for Ingres D in the Projects page, (that project having been abandoned).
23 May 2013In Reference Material, minor revisions to Tutorial D (also reflected in the grammar in alphabetical order of BNF terms)
05 May 2013Added a forthcoming presentation and, to appear later in 2013, a book, and a couple of videos.
02 APRIL 2013Updated Projects page to announce new version of DuroDBMS (formerly known as Duro).
11 FEBRUARY 2013Posted revision of TTM affecting RM Pre 1 and RM Pre 8. Removed Database Explorations from Books for Sale. In Documents and Books, revised entry for View Updating and Relational Theory, which was published in January.
08 FEBRUARY 2013
Belatedly posted the minor revision of Tutorial D that was made on October 30th, 2011. Copied the Inheritance Model to the Reference Material page.
15 November 2012In Papers, added The Relational Model by Hugh Darwen, intended for readers of the autumn 2012 issue of the IEEE Annals of The History of Computing.
09 november 2012
In Documents and Books, added HD's new book SQL: A Comparative Survey and an errata for Temporal Data and The Relational Model.