Titlebook: Logic and Data Bases; Hervé Gallaire,Jack Minker Book 1978 Springer Science+Business Media New York 1978 Area.Logic.Mathematica.framework.

利用

978-1-4684-3386-9Springer Science+Business Media New York 1978

柱廊

Overview: 978-1-4684-3386-9978-1-4684-3384-5

暗諷

frugal

Cursory

An Overview and Introduction to Logic and Data Bases, as well as an introduction to the major ideas discussed in the individual chapters. The first section of this paper is devoted to a description of first order logic, while the second describes the relational data base model. The next sections summarize the five major units of chapters..The theme o

HIKE

袋鼠

On Closed World Data Basesclosed world assumptions. The open world assumption corresponds to the usual first order approach to query evaluation: Given a data base DB and a query Q, the only answers to Q are those which obtain from proofs of Q given DB as hypotheses. Under the closed world assumption, certain answers are admi

aerial

Logic for Data Descriptiona bases depends upon the form of definitions: whether data is defined by means of complete if-and-only-if definitions or only by means of the if-halves, whether the only-if half of an if-and-only-if definition is stated explicitly or is assumed implicitly, and whether the only-if assumption is under

防銹

An Experimental Relational Data Base System Based on Logicul way in which to represent knowledge, and it forms a mathematical basis both for reasoning with data and for maintaining the integrity of a data base. The latter is a needed capability of data base systems as one wants to derive new facts from facts listed explicitly in the data base..The system i

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