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An Example and In-class EX Who teaches what. f1: teaches(john, database, s1). f2: teaches(john, ai, s1). f3: teaches(mary, os, s1). f4: teaches(mary, ai, s2). f5: teaches(paul, compiler, s1). Query 1: What's the course taught by John and Mary? ?- teaches(john, X, _), teaches(mary, X, _). Query 2: Who teaches both os and compiler?

An Example and In-class EX Who teaches what. f1: teaches(john, database, s1). f2: teaches(john, ai, s1). f3: teaches(mary, os, s1). f4: teaches(mary, ai, s2). f5: teaches(paul, compiler, s1). Query 1: What's the course taught by John and Mary? ?- teaches(john, X, _), teaches(mary, X, _). Query 2: Who teaches both os and compiler?

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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Conjunctions and Backtracking.

Using the example of "Who teaches what" try to trace through search process for Query 2

An Example and In-class EX Who teaches what. f1: teaches(john, database, s1). f2: teaches(john, ai, s1). f3: teaches(mary, os, s1). f4: teaches(mary, ai, s2). f5: teaches(paul, compiler, s1). Query 1: What's the course taught by John and Mary? ?- teaches(john, X, _), teaches(mary, X, _). Query 2: Who teaches both os and compiler? ?- teaches(X, os, _), teaches(X, compiler, ).
Transcribed Image Text:An Example and In-class EX Who teaches what. f1: teaches(john, database, s1). f2: teaches(john, ai, s1). f3: teaches(mary, os, s1). f4: teaches(mary, ai, s2). f5: teaches(paul, compiler, s1). Query 1: What's the course taught by John and Mary? ?- teaches(john, X, _), teaches(mary, X, _). Query 2: Who teaches both os and compiler? ?- teaches(X, os, _), teaches(X, compiler, ).
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