I am learning about DB systems. I have two queries: P1: H(x,y) ← A(x,z) AND A(z,y)...
I am learning about DB systems. I have two queries:
P1: H(x,y) ← A(x,z) AND A(z,y)
P2: H(a,b) ← A(a,c) AND A(c,d) AND A(d,b)
I need to show that there is no containment mapping from P2 to P1.
How do i solve this problem...
Thanks!
Homework Answers
Solution :-
P1: H(x,y) ← A(x,z) AND A(z,y)
P2: H(a,b) ← A(a,c) AND A(c,d) AND A(d,b)
1) a->x and b->y required for head
2)Thus, first subgoal of P2 must map to first subgoal of P1 , c must map to z (c->z)
3)Similarly second subgoal of P2 must map to second subgoal of P1 , d must map to y (d->y)
4) Since subgoal A(y,y) does not exist in P1 for subgoal A(d,b) in P2 (b->y and d->y) hence there is no containment mapping from P2 to P1
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I have some questions when solving this problem.
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