Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
Expert Solution & Answer
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Chapter 7, Problem 1PE

Explanation of Solution

Lossless decomposition:

A decomposition {R1,R2} is known to be lossless join decomposition when the relation R1R2R1 or R1R2R2.

Using the given decomposed schemas:

Considering the decomposed schema to be:

R1=(A,B,C)R2=(A,D,E)

Now,

R1R2A

Here, A is considered to be the candidate key which can be implied to be that R1R2R1 but not in the other way.

Therefore, the given decomposition is loss-less decomposition when A is considered to be the candidate key.

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