By Robert Colomb
An introductory textual content geared toward people with an undergraduate wisdom of database & info structures 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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Extra resources for Deductive Databases and Their Applications
Its source is its first argument, and its target its second. 7 A chain object type, with two chain objects. 8 A tree object type, with two tree objects. 9 Directed acyclic graph object type, with two DAGs. There are many special forms of graphs. 6) and by additional predicates. We will consider a few generally useful cases: chain, tree, directed acyclic graph, directed graph and undirected graph. 7. The chain condition is enforced by the uniqueness constraints on the arc relationship. Notice that the derived relationship is many-to-many even though the arc relationship is one-to-one.
Ancestor(mary, peter). ancestor(mary, paul). ancestor(paul, John). ancestor(paul, sue). DATALOG AND BOTTOM-UP EVALUATION 39 ancestor(sue, alice). ancestor(sue, eva). M1=M0 T(M0) T(M1)= ancestor(bill, John). ancestor(bill, sue). ancestor(mary, John). ancestor(mary, sue). ancestor(paul, alice). ancestor(paul, eva). plus the tuples in T(M0) M2=M1 T(M1) T(M2)= ancestor(bill, alice). ancestor(bill, eva). ancestor(mary, alice). ancestor(mary, eva). plus the tuples in T(M1) M3=M2 T(M2) T(M3) is only the tuples in T(M2) M4=M3 T(M3)=M3 Notice that in the example we eventually reach a point where T does not add any tuples to the database.
Two useful concepts in directed graphs are source and sink. A source is a node which is the source of arcs but the target of none, while a sink is a node which is the target of arcs but the source of none. 7 are anchors of one chain, while e and g are anchors of the other). In a tree, there is one source (the root) and possibly many sinks (the leaves). 8, node a is a root, while nodes c, e and f are leaves. Similarly, node g is a root, and nodes h and i are leaves. A DAG also has possibly many sources.