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CSC 4402 20091102

CSC 4402 20091102 - The best way to find the compact...

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CSC 4402 11/2/2009 Page 1 of 1 Armstrong’s rules are both sound and complete . Sound means that anything derived from F will be in the closure of F, F + . Complete means that anything found in the closure of F will be found by repeatedly applying the rules. The attribute closure of X, X + , is the set of all attributes that depend on X.
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Unformatted text preview: The best way to find the compact representation of F + is to find the attribute closure of all possible attribute pairs; then combine those into one set of distinct elements. This is shown on page 9 of the first functional dependencies handout....
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