Deductive Databases and Their Applications by Robert Colomb

By Robert Colomb

An introductory textual content geared toward people with an undergraduate wisdom of database & details platforms describing the origins of deductive database in Prolog, & then is going directly to examine the most deductive database paradigm - the datalog version.

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An introductory textual content geared toward people with an undergraduate wisdom of database & details platforms describing the origins of deductive database in Prolog, & then is going directly to examine the most deductive database paradigm - the datalog version.

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Ancestor(sue, eva). Δ2 = ancestor(bill, John). ancestor(bill, sue). ancestor(mary, John). ancestor(mary, sue). ancestor(paul, alice). ancestor(paul, eva). Δ3 = ancestor(bill, alice). ancestor(bill, eva). ancestor(mary, alice). ancestor(mary, eva). Δ4 is empty, so the semi-naive algorithm terminates. 4 shows that when there is more than one IDB subgoal in an IDB rule, one rule can generate more than one contribution to Δ. Generally, there can be a contribution to Δ from an IDB rule for each IDB subgoal in that rule.

It is, however, common for an application to have a set of integrity constraints, which are implemented as a set of queries which must be satisfied for any valid instance of the system. In our formalism, these integrity constraints are clauses with no positive literal, which are stored and manipulated in much the same way as the other clauses. An integrity constraint is thus similar to a goal, in that a goal is a clause with no head predicate. A program with integrity constraints is not a normal program.

Person(eva). ancestor(bill, John). ancestor(bill, sue). ancestor(mary, John). ancestor(mary, sue). ancestor(paul, alice). ancestor(paul, eva). parent(bill, peter). parent(bill, paul). parent(mary, peter). parent(mary, paul). parent(paul, John). parent(paul, sue). parent(sue, alice). parent(sue, eva). ancestor(bill, peter). ancestor(bill, paul). ancestor(mary, peter). ancestor(mary, paul). ancestor(paul, John). ancestor(paul, sue). ancestor(sue, alice). ancestor(sue, eva). ancestor(bill, alice).

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