Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 22 Sep 2017 My Price 4.00

Armstrong’s Axioms

1.Prove that Armstrong’s Axioms are sound and complete for FD inference. That is, show that repeated application of these axioms on a set F of FDs produces exactly the dependencies in F+.

2.Consider a relation R with attributes ABCDE. Let the following FDs be given: A → BC, BC → E, and E → DA. Similarly, let S be a relation with attributes  ABCDE and let the following FDs be given: A → BC, B → E, and E → DA. (Only the second dependency differs from those that hold over R.) You do not know whether or which other (join) dependencies hold.

  1. Is R in BCNF?
  2. Is R in 4NF?
  3. Is R in 5NF?
  4. Is S in BCNF?
  5. Is S in 4NF?
  6. Is S in 5NF?

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Maurice Tutor
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Status NEW Posted 22 Sep 2017 09:09 PM My Price 4.00

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