Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 7, Problem 5PE

Explanation of Solution

Three Armstrong’s axiom:

The below are three Armstrong’s axiom and they are

  • Reflexivity
    • A is considered to be set of attributes
    • BC and BA then AB
  • Augmentation
    • A is considered to be set of attributes
    • BC, then ABAC will also hold
  • Transitivity
    •  AB and BA, then AC can also be hold.

Soundness of the Pseudo-transitivity rule:

Pseudo-transitivity rule states that,

When αβ  and γβδ holds, αγδ then can also hold

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