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  1. #1
    Join Date
    Mar 2012
    Posts
    3

    Unanswered: ER diagram from functional dependencies

    looking at question b), how do you draw an E-R diagram from a bunch of functional dependencies?
    I mean, where do you start? Can I just pick, say, E to be the starting point and have branches coming out to all the other attributes? I have no idea
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  2. #2
    Join Date
    Nov 2002
    Location
    Jersey
    Posts
    10,322
    I would never pass a class these days
    Brett
    8-)

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    The physical order of data in a database has no meaning.

  3. #3
    Join Date
    Mar 2012
    Posts
    3
    the thing is, it seems like it should be such a simple thing to do
    yet it appears the internet has never seen this question before; I've looked everywhere

  4. #4
    Join Date
    Mar 2012
    Posts
    3
    just in case anyone was wondering how to solve the problem, this email just came in
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  5. #5
    Join Date
    Jan 2003
    Location
    Massachusetts
    Posts
    5,800
    Provided Answers: 11
    I was wondering about the dependency loop in there.

  6. #6
    Join Date
    Nov 2004
    Posts
    1,427
    Provided Answers: 4
    This is a nice example of the "Wally Period"(*): it's the period between getting an important, urgent task from management and the time they need to change their whole mind and give you another important, urgent task. They will never ask you about that previous task, as it's no longer important. Any time and effort you've spend on the previous task is lost and will never be rewarded.

    (*) From Dilbert.
    With kind regards . . . . . SQL Server 2000/2005/2012
    Wim

    Grabel's Law: 2 is not equal to 3 -- not even for very large values of 2.
    Pat Phelan's Law: 2 very definitely CAN equal 3 -- in at least two programming languages

  7. #7
    Join Date
    Nov 2004
    Posts
    1,427
    Provided Answers: 4
    Me too, but I had the same feeling as Brett: "I would never pass a class these days".
    With kind regards . . . . . SQL Server 2000/2005/2012
    Wim

    Grabel's Law: 2 is not equal to 3 -- not even for very large values of 2.
    Pat Phelan's Law: 2 very definitely CAN equal 3 -- in at least two programming languages

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