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    FAQ article on nulls needs correction

    I have commented on this FAQ article by The_Doc_Man before. Unfortunately I just came across another reference to it and so I'm making a plea to reason here: please, please correct this article (or preferably delete it!) Here is an excerpt: This is so completely wrong. In relational and SQL...
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    Candidate Key

    The question arose yesterday of whether and where Microsoft document what a candidate key is. The following definition published by Microsoft seems like a perfectly OK one (with one possible quibble that in the relational model keys are supposed to be irreducible as well as uniquely...
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