(c) Assume that a Prolog database contains the following facts p(a) q(a,1) r(1,1) r(3,5) p(b) q(a,2)...

 

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(c) Assume that a Prolog database contains the following facts p(a) q(a,1) r(1,1) r(3,5) p(b) q(a,2) r(1,2) r(3,6) q (b,3) r(2,3) r(4,7) q(b, 4) r(2,4) r(4,8) What are the effects of the following queries? 1 2 3 - p(x),q(X,Y), ,r (Y,Z) - P(X), once (q(X,Y)),r (Y,Z) p(x),,q(X,Y) (c) Assume that a Prolog database contains the following facts p(a) q(a,1) r(1,1) r(3,5) p(b) q(a,2) r(1,2) r(3,6) q (b,3) r(2,3) r(4,7) q(b, 4) r(2,4) r(4,8) What are the effects of the following queries? 1 2 3 - p(x),q(X,Y), ,r (Y,Z) - P(X), once (q(X,Y)),r (Y,Z) p(x),,q(X,Y)