RosettaCodeData/Task/Hash-join/Prolog/hash-join.pro

21 lines
568 B
Prolog

% Name/Age
person_age('Jonah', 27).
person_age('Alan', 18).
person_age('Glory', 28).
person_age('Popeye', 18).
person_age('Alan', 28).
% Character/Nemesis
character_nemisis('Jonah', 'Whales').
character_nemisis('Jonah', 'Spiders').
character_nemisis('Alan', 'Ghosts').
character_nemisis('Alan', 'Zombies').
character_nemisis('Glory', 'Buffy').
join_and_print :-
format('Age\tName\tCharacter\tNemisis\n\n'),
forall(
(person_age(Person, Age), character_nemisis(Person, Nemesis)),
format('~w\t~w\t~w\t\t~w\n', [Age, Person, Person, Nemesis])
).