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  • Re: Disjunctive Reference Schemes

    Hi Peter, [quote user="PeterC"]I'm really more interested in your statement that Primary Key columns should never contain NULLs. Why?[/quote] Here is the answer to your question: 1. As Terry explains in his book, the term key means "a minimal combination of columns where no duplicates...
    Posted to User experience (Forum) by Ken Evans on 03-28-2009
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