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Describe a polynomial-time algorithm to test dependency

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Let R be decomposed into R1, R2, ..., Rn. Let F be a set of FDs on R. 

1. De?ne what it means for F to be preserved in the set of decomposed relations.

2. Describe a polynomial-time algorithm to test dependency-preservation.

3. Projecting the FDs stated over a set of attributes X onto a subset of attributes Y requires that we consider the closure of the FDs. Give an example where considering the closure is important in testing dependency-preservation, that is, considering just the given FDs gives incorrect results.

Reference no: EM13509361

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