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What is the answer to the Prolog query ?- person(X), \+ girl(X).

What is the answer to the Prolog query ?- person(X), \+ girl(X).

Database System Concepts
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
Problem 1PE
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For the following questions, consider this Prolog program: ``` person(mary). person(john). girl(mary). boy(john). ```
Transcribed Image Text:For the following questions, consider this Prolog program: ``` person(mary). person(john). girl(mary). boy(john). ```
**Understanding Prolog Queries** **Question:** What is the answer to the Prolog query ```prolog ?- person(X), \+ girl(X). ``` **Explanation:** This query is asking for elements `X` such that `X` is a person and `X` is not a girl. The predicates `person(X)` and `\+ girl(X)` are used to filter the results in Prolog based on the defined facts and rules in the knowledge base. - `person(X)`: A predicate that checks if `X` is defined as a person in the database. - `\+ girl(X)`: A negation predicate that checks that `X` is not defined as a girl in the database. The query will return all `X` that satisfy these conditions. The blank box is where the result of the query would typically be displayed once it is processed by Prolog. This example demonstrates the use of logical operations in Prolog to retrieve specific data from a database based on defined criteria.
Transcribed Image Text:**Understanding Prolog Queries** **Question:** What is the answer to the Prolog query ```prolog ?- person(X), \+ girl(X). ``` **Explanation:** This query is asking for elements `X` such that `X` is a person and `X` is not a girl. The predicates `person(X)` and `\+ girl(X)` are used to filter the results in Prolog based on the defined facts and rules in the knowledge base. - `person(X)`: A predicate that checks if `X` is defined as a person in the database. - `\+ girl(X)`: A negation predicate that checks that `X` is not defined as a girl in the database. The query will return all `X` that satisfy these conditions. The blank box is where the result of the query would typically be displayed once it is processed by Prolog. This example demonstrates the use of logical operations in Prolog to retrieve specific data from a database based on defined criteria.
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