EBK DATABASE SYSTEM CONCEPTS
EBK DATABASE SYSTEM CONCEPTS
7th Edition
ISBN: 9781260049268
Author: SILBERSCHATZ
Publisher: MCG COURSE
Expert Solution & Answer
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Chapter 7, Problem 13PE

Explanation of Solution

To prove the decomposition is not a dependency preserving decomposition:

The schema R= (A,B,C,D,E) is being decomposed into (A,B,C) and (D,E,F) along with functional dependencies that are defined and holds true.

The decomposition does not preserve the functional dependencies BD

Proof:

Considering the restriction of the functional dependency F to the decomposition (A,B,C) also called as F1:

F1=AABC,AAB,AAC,ABC,AB,AC,AA,BB,CC,ABC,ABABC,ABBC,ABAB,ABA,ABB

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