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  1. #1
    Join Date
    Jan 2005
    Posts
    2

    Cool functional dependencies

    hi,
    i am a engineering student in india.i have a doubt regarding the database design.

    in the logical database design we use the concept of functional dependencies and the closure using Amstrong's axioms . What is the basic necessity to find the closure of the functional dependencies.

    one more Question::
    if we have a relation R(a,b,c,d,e) and a set of functional dependencies F. when we want to update is it sufficient if it satisfies F or do we need to satisfy the closure of F and why?

    whoever is interested please give a reply to m mail swaroopreddy_k@yahoo.co.uk

    thank you
    Last edited by swaroopreddy; 01-06-05 at 22:44.

  2. #2
    Join Date
    Apr 2002
    Location
    Toronto, Canada
    Posts
    20,002
    that's curious, you aren't the only one recently with a question about armstrong

    maybe you could get together with this person -- http://www.dbforums.com/t1084083.html
    rudy.ca | @rudydotca
    Buy my SitePoint book: Simply SQL

  3. #3
    Join Date
    Mar 2004
    Posts
    28

    Post

    Hi,
    i suggest you take a look at this link i found in google.
    http://www.dbis.informatik.hu-berlin.../Maier/C04.pdf
    its very helpful, and i predict that it will answer your questions.
    p.s if you find the answers would you mind posting it?
    best wishes
    b737

    i coped on to what i asked in the above link.thanks for the help.
    Last edited by b737; 01-07-05 at 13:20.

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