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Foundations of Deductive Databases and Logic Programming
book

Foundations of Deductive Databases and Logic Programming

by Jack Minker
May 2014
Intermediate to advanced content levelIntermediate to advanced
752 pages
35h 3m
English
Morgan Kaufmann
Content preview from Foundations of Deductive Databases and Logic Programming
674 Sagiv
Tuple-Generating
Dependencies
A tuple-generating dependency (tgd) (Been and Vardi [1984], Fagin [1982],
Yannakakis and Papadimitriou [1982]) is a formula of the form
VJC
3y
1
(JC
)
-^ψ
2
(x , y )], where χ and y are vectors of variables and both ψ
1
and ψ
2
are
conjunctions of atoms. We write a tgd without the quantifiers, e.g.,
G(y,z)
G(y,w)
Λ C(u>) instead of Vy Vz 3w
[G(y,z)
G(y,w)
Λ C(w>)]. Univer-
sally quantified variables are those appearing in the left-hand side of the for-
mula (these variables can also appear in the right-hand side). Existentially
quantified variables are those appearing only in the right-hand side of th ...
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Publisher Resources

ISBN: 9781483221120