Suppose that a Prolog database contains the following entries: eat(bear, fish) eat(fish, littlefish) eat(littlefish, algae) eat(raccoon, fish) eat(bear, raccoon) eat(bear, fox) eat(fox, rabbit) eat(rabbit, grass) eat(bear, deer) eat(deer, grass) eat(wildcat, deer) animal(bear) animal(fish) animal(littlefish) animal(raccoon) animal(fox) animal(rabbit) animal(deer) animal(wildcat) plant(grass) plant(algae) prey(X) <= eat(Y, X) and animal(X) Then the following dialog with Prolog could take place: ?animal(rabbit) yes ?eat(wildcat, grass) no ?eat(X, fish) bear гасcoon гасcoon ?eat(X, Y) and plant(Y) littlefish fox algae rabbit rabbit grass deer deer grass deer ?prey(X) Note that fish is listed twice as satisfying the last query because fish are eaten by bear (fact 1) and by raccoon (fact 3). Similarly, deer are eaten by both bear and wildcat. fish littlefish fish

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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find the results of the query in each case.

?eat(raccoon, X )

Suppose that a Prolog database contains the following entries:
eat(bear, fish)
eat(fish, littlefish)
eat(littlefish, algae)
eat(raccoon, fish)
eat(bear, raccoon)
eat(bear, fox)
eat(fox, rabbit)
eat(rabbit, grass)
eat(bear, deer)
eat(deer, grass)
eat(wildcat, deer)
animal(bear)
animal(fish)
animal(littlefish)
animal(raccoon)
animal(fox)
animal(rabbit)
animal(deer)
animal(wildcat)
plant(grass)
plant(algae)
prey(X) <= eat(Y, X) and animal(X)
Then the following dialog with Prolog could take place:
?animal(rabbit)
yes
?eat(wildcat, grass)
no
?eat(X, fish)
bear
гасcoon
гасcoon
?eat(X, Y) and plant(Y)
littlefish
fox
algae
rabbit
rabbit
grass
deer
deer
grass
deer
?prey(X)
Note that fish is listed twice as satisfying the last query because fish are eaten by
bear (fact 1) and by raccoon (fact 3). Similarly, deer are eaten by both bear and
wildcat.
fish
littlefish
fish
Transcribed Image Text:Suppose that a Prolog database contains the following entries: eat(bear, fish) eat(fish, littlefish) eat(littlefish, algae) eat(raccoon, fish) eat(bear, raccoon) eat(bear, fox) eat(fox, rabbit) eat(rabbit, grass) eat(bear, deer) eat(deer, grass) eat(wildcat, deer) animal(bear) animal(fish) animal(littlefish) animal(raccoon) animal(fox) animal(rabbit) animal(deer) animal(wildcat) plant(grass) plant(algae) prey(X) <= eat(Y, X) and animal(X) Then the following dialog with Prolog could take place: ?animal(rabbit) yes ?eat(wildcat, grass) no ?eat(X, fish) bear гасcoon гасcoon ?eat(X, Y) and plant(Y) littlefish fox algae rabbit rabbit grass deer deer grass deer ?prey(X) Note that fish is listed twice as satisfying the last query because fish are eaten by bear (fact 1) and by raccoon (fact 3). Similarly, deer are eaten by both bear and wildcat. fish littlefish fish
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