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  1. #1
    Join Date
    Sep 2011

    Relational Algebra

    Hey we know that relational algebra is domain independent but going into theoretical How to prove relational algebra as domain independent ,can we do it by induction if so how.. ??

  2. #2
    Join Date
    Jan 2003
    Well, I am going to make the wild assumption that this is for some class. That being the case, what is the definition (from the book) of domain independence? Proofs at the beginning of the year usually flow from the definitions.

  3. #3
    Join Date
    Feb 2004
    In front of the computer
    One of my college profs gave one extra credit question on every essay test that required "thinking outside the box" which I loved. I was the only student in his teaching history to score points on every one of those questions.

    Your "Induction" reference reminds me of his first "thinking outside the box" question, which was "Define the Universe. Give three examples."

    In theory, theory and practice are identical. In practice, theory and practice are unrelated.

  4. #4
    Join Date
    Apr 2002
    Toronto, Canada
    and one counterexample | @rudydotca
    Buy my SitePoint book: Simply SQL

  5. #5
    Join Date
    Nov 2004
    on the wrong server
    I was in a great books program in college. No textbooks. All primary sources. Most classes involved papers or essay exams. High points were always given for turning the question on it's head or questioning it's validity.
    “If one brings so much courage to this world the world has to kill them or break them, so of course it kills them. The world breaks every one and afterward many are strong at the broken places. But those that will not break it kills. It kills the very good and the very gentle and the very brave impartially. If you are none of these you can be sure it will kill you too but there will be no special hurry.” Earnest Hemingway, A Farewell To Arms.

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