20 May 2015Added David Bennett's Andl to the Projects page. Also reordered the list so that projects known to be currently active appear first. Also bookmarked each section and added a TOC.
08 May 2015In Events, updated the entry concerning Chris Date's presentations in South Africa, now being rescheduled for October 2015.
06 March 2015In Events, added Chris Date's forthcoming presentations at Oracle University Expert Summits.
In Presentations, added five more O'Reilly videos by Chris Date.
02 January 2015In the Papers section, added An Algebra of Relations for Machine Computation by Patrick Hall, Peter Hitchcock, and Stephen Todd (1975) annotatedby Hugh Darwen.
12 NOVEMber 2014Added The Influence of ISBL to the Papers section.
03 OCTOber 2014Added bookmarks to the free download PDF copy of Databases, Types, and The Relational Model in Documents and Books.
27 September 2014Placed a free download PDF copy of Databases, Types, and The Relational Model in Documents and Books.
29 August 2014Replaced the free download PDF copy of Database Explorations in Documents and Books. The new copy has bookmarks--many thanks to Gabriele Fava for devoting many hours to this task for us!
22 August 2014In Events, notification of Chris Date's presentation in Sydney, Australia, December 10.
20 August 2014Placed a free download PDF copy of Database Explorations in Documents and Books.
03 May 2014Added new book Time and Relational Theory (to appear some time in 2014) to Documents and Books. Also added Erwin Smout's paper, referenced by this book, titled Could packing be specified in terms of closed-open interval semantics without having to commit to granularity? to the papers section.
27 January 2014Updated the Projects entry for DuroDBMS to mention new version, 0.20.
18 NOVEMBER 2013In Papers, added Hugh Darwen's preliminary proposal for user-defined generic relational operators in Tutorial D.
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.
23 May 2013In Reference Material, minor revisions to Tutorial D (also reflected in the grammar in alphabetical order of BNF terms)
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.