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It's a very fierce academic debate. People have fallen out over it. Theorectically I agree it does, but practically it is difficult to not to have it. If you are genuinely interested google the works of C J Date and Fabian Pascal. The problem is it has no meaning in the database. Maybe staff...

I tend to view the world at work through databases and don't even work in IT. True, I'm afraid. I always try and work the tables out in my head when 99% of the time no database is involved. I'm quite rigourous about it. For database designers here I even try and elimate the use of NULL since...