le 4 B ∧ E ∧ F → G

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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(1) How to prove H using given rules and facts:

Rules:

Rule 1 A ∧ B → C

Rule 2 A → D

Rule 3 C ∧ D → E

Rule 4 B ∧ E ∧ F → G

Rule 5 A ∧ E → H

Facts:

Fact 1 A

Fact 2 B

Fact 3 F

Hint:

The goal is to prove H.

First let us use forward chaining. As the conflict resolution strategy, one will

fire rules in the order they appear in the database. Let us fire Rule 1,

which means to add C to the fact database. Next, Rule 2 is fired,

meaning we add D to our fact database.

We now have the facts A, B, C, D, F, but we have not yet reached our goal,

which is H.

 

Please list the rules to be triggered to add fact H to the database.

Now consider using backward chaining.

Does backward chaining use fewer rules?

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