Archive for November, 2015

long, strange trip

November 25, 2015

Thanks to google’s insatiable appetite for scanning and offering documents, you can take a trip back to a 1994 issue of Computer World magazine, read about Windows NT, cc:Mail, pentium processors, and see an ad for Oracle CDE, featuring yours truly looking over his shoulder.  (Remember Oracle CDE?)  This was my first Oracle DBA gig, and the team received a Smithsonian Award for a global client/server customer information system that we built on Oracle 7 (and DB2, via Oracle Transparent Gateway).

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Tarski and Codd

November 25, 2015

Wikipedia says that “Relational calculus is essentially equivalent to first-order logic, and indeed, Codd’s Theorem had been known to logicians since the late 1940s.”  I couldn’t find the cited sources online, but did find these interesting papers:

Applications of Alfred Tarski’s Ideas in Database Theory

and

Tarski’s influence on computer science.” (see the section starting “The final thing I want to tell something about is the connection of Tarski’s ideas and work with database theory.”)

If you’ve studied mathematical logic (or math, eg, topology), you are probably familiar with Tarski’s name.  The historical development of mathematical logic and relational database theory is an interesting topic I’d like to understand better.    Codd’s 1970 paper is fairly readable, and this 1972 paper is related to the correspondences between the different approaches taken.