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Go Back  dBforums > General > Database Concepts & Design > Functional dependecy

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Old 04-23-09, 13:40
dbbasic dbbasic is offline
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Functional dependecy
Can anyone give me the link on good tutoral on functional dependency? I am stuck with following problem

I need algortihmic poof for following
Give a proof that the functional dependency A → B does not logically imply the functional dependency A → BC. That is, prove A → B ! |= A → BC


thanks
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Old 04-23-09, 15:48
dportas dportas is offline
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Lookup Armstrong's Axioms. What would the decomposition of A → Bx imply?
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