1. There exists a relation S(A, B, C, D, E, F) with the below functional dependencies. {A}→{D} {A}→{E} {D} {C} {D}→{F} Please answer true or false to the following statements with a short explanation as to why. a. Is A,B a superkey? b. Is the decomposition ABC, CDE, EFA a lossless join? c. Is the decomposition ABC, CDE, EFA a dependency preserving? d. Is {A} {E,F} logically implied by FDs present in the relation? e. Is relation S in BCNF?

a. No, A,B is not a superkey. The functional dependency {A}>{E} implies that A is not a superkey.…

Answered: 1. There exists a relation S(A, B, C, D, E, F) with the below functional dependencies. {A}→{D} {A}→{E} {D} {C} {D}→{F} Please answer true or false to the…

Database System Concepts

7th Edition

ISBN: 9780078022159

Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher: McGraw-Hill Education

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1. There exists a relation S(A, B, C, D, E, F) with the below functional dependencies.
{A}→{D}
{A}→{E}
{D} {C}
{D}→{F}
Please answer true or false to the following statements with a short explanation as to why.
a. Is A,B a superkey?
b. Is the decomposition ABC, CDE, EFA a lossless join?
c. Is the decomposition ABC, CDE, EFA a dependency preserving?
d. Is {A}→{E,F} logically implied by FDs present in the relation?
e. Is relation S in BCNF?

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