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darren
2006 Jun 30
0
Three ActiveRecord features we want at work - any comments/suggestions?
...st wish will raise a few eyebrows :) The sad truth is
that NULLs invalidate pretty much all of the relational database
theory that SQL is (supposedly) based on. I won''t dwell on this, if
you aren''t convinced read pretty much anything by Chris Dates, Fabian
Pascal or Hugh Darwen (eg http://www.comp.leeds.ac.uk/pd31/Notes/
Darwen.pdf)
All three authors have suggested different solutions to the problem,
but the one I like best is proposed in the PDF by Darwen, referenced
above. Basically instead of using a flag (ie NULL) in each table to
indicate a missing value, yo...