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E xercise 3.2.10: Suppose we have relation R(A,B,C,D ,E), with some set of FDs, and we wish to project those FDs onto relation S(A, B,
E xercise 3.2.10: Suppose we have relation R(A,B,C,D ,E), with some set of FDs, and we wish to project those FDs onto relation S(A, B, C). Give the FDs that hold in S if the FDs for R are:
a) AB >DE, C >E, D >C, and E >A.
b) A > D : BD > E, AC > E, and DE > B.
c) AB > D , AC > E, BC > D , D > A , and E > B.
d) A ---> B, B---> C, C----> D, D -----> E, and E ---->A..
In each case, it is sufficient to give a minimal basis for the full set of FDs of S.
Please give the method and the answer.
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