Press "Enter" to skip to content

Get Conceptual Modelling and Its Theoretical Foundations: Essays PDF

By Antje Düsterhöft, Meike Klettke, Klaus-Dieter Schewe

ISBN-10: 3642282784

ISBN-13: 9783642282782

ISBN-10: 3642282792

ISBN-13: 9783642282799

This Festschrift, released in honor of Bernhard Thalheim at the social gathering of his sixtieth birthday provides 20 articles by way of colleagues from around the globe with whom Bernhard Thalheim had cooperation in quite a few respects; additionally incorporated is a systematic biography contributed via the amount editors. The 20 contributions replicate the breadth and the intensity of the paintings of Bernhard Thalheim in conceptual modeling and database concept in the course of his clinical occupation spanning greater than 35 years of lively learn. particularly, ten articles are concentrating on themes like database dependency thought, object-oriented databases, triggers, summary kingdom machines, database and knowledge structures layout, net semantics, and company processes.

Show description

Read Online or Download Conceptual Modelling and Its Theoretical Foundations: Essays Dedicated to Bernhard Thalheim on the Occasion of His 60th Birthday PDF

Best compilers books

Download e-book for iPad: Case-Based Reasoning Research and Development: 8th by Lorraine McGinty, David C. Wilson

This e-book constitutes the refereed lawsuits of the eighth overseas convention on Case-Based Reasoning, ICCBR 2009, held in Seattle, WA, united states, in July 2009. The 17 revised complete papers and 17 revised poster papers awarded including 2 invited talks have been conscientiously reviewed and chosen from fifty five submissions.

Read e-book online The Verilog® Hardware Description Language PDF

Xv From the outdated to the hot xvii Acknowledgments xxi 1 Verilog – an academic advent 1 Getting all started 2 A Structural Description 2 Simulating the binaryToESeg motive force four growing Ports For the Module 7 making a Testbench For a Module eight eleven Behavioral Modeling of Combinational Circuits Procedural versions 12 ideas for Synthesizing Combinational Circuits thirteen 14 Procedural Modeling of Clocked Sequential Circuits Modeling Finite nation Machines 15 principles for Synthesizing Sequential platforms 18 Non-Blocking project ("

Download e-book for kindle: The Art of Lisp Programming by Robin Jones

Many folks have already got at the least a passing acquaintance with procedural languages similar to simple or Pascal, yet won't have met a sensible language like Lisp sooner than. utilizing an analogous stress-free and occasionally quirky sort that they hired so effectively in "The paintings of C-Programming", Robin Jones and his group clarify the basics of Lisp in a fashion that scholars from institution to postgraduates will locate lucid and stimulating.

Languages and Compilers for Parallel Computing: 29th - download pdf or read online

This booklet constitutes the completely refereed post-conference complaints of the twenty ninth overseas Workshop on Languages and Compilers for Parallel Computing, LCPC 2016, held in Rochester, long island, united states, in September 2016. The 20 revised complete papers offered including four brief papers have been rigorously reviewed.

Additional resources for Conceptual Modelling and Its Theoretical Foundations: Essays Dedicated to Bernhard Thalheim on the Occasion of His 60th Birthday

Example text

Random tuples (or records), respectively. One of basic database operations, join, combines two tables into a third one by matching values for given columns (attributes). , names) from the tables. , Kiefer et al. 2005, Copas and Hilton, 1990, and references therein). , Seleznjev and Thalheim (2008). A set of attributes A in a table T is called an -key (test) if there are no -close sub-tuples tA (j), j = 1, . . , m. , Thalheim (2000). By joining a table with itself (self-join) we identify also -keys and key-properties for a set of attributes for a random table (Seleznjev and Thalheim, 2003, Leonenko and Seleznjev, 2010).

Proof. We have to prove that (i) and (ii) imply both (6) and (7). Let us start with some elementary lemmas. The first two of them prove that if a sequence of non-negative numbers is given with a fixed sum and an upper bound c is given on them then the sum of their squares is maximized for a choice with (one exception) all members = c or 0. We give the proof for sake of completeness. Lemma 1. Let the real numbers 0 ≤ a, b, c satisfy the inequalities b ≤ a ≤ c ≤ a + b. Then (10) a2 + b2 ≤ c2 + (a + b − c)2 holds.

Applying the notions introduced above to the comparison of the special situation of Proposition 1 with the more general case, we see the following. Each of the attributes a and b of the special situation is 1-prime and forms a singleton ∼mk -equivalence class; correspondingly, in the general situation each of the sets K1 \ E and K2 \ E consists of 1-prime attributes and forms an ∼mk -equivalence class. Summarizing and formalizing the arguments given so far, the general situation of schemes having exactly two minimal keys is fully characterized by the following Theorem 1 and visualized in Figure 1.

Download PDF sample

Conceptual Modelling and Its Theoretical Foundations: Essays Dedicated to Bernhard Thalheim on the Occasion of His 60th Birthday by Antje Düsterhöft, Meike Klettke, Klaus-Dieter Schewe


by Charles
4.2

Rated 4.93 of 5 – based on 22 votes