Copied The Problem of Incomplete Information in Relational Databases
The Problem of Incomplete Information in Relational Databases
In a relational database the information is recorded as rows in tables. However, in many practical situations the available information is incomplete and the values for some columns are missing. Yet few existing database management systems allow the user to enter null values in the database. This monograph analyses the problems raised by allowing null values in relational databases. The analysis covers semantical, syntactical, and computational aspects. Algorithms for query evaluation, dependency enforcement and updates in the presence of null values are also given. The analysis of the computational complexity of the algorithms suggests that from a practical point of view the database should be stored as Horn tables, which are generalizations of ordinary relations, allowing null values and Horn clause-like restrictions on these null values. Horn tables efficiently support a large class of queries, dependencies and updates.
Price Comparison
| Seller | Contact Seller | List Price | On Sale | Shipping | Best Promo | Final Price | Volume Discount | Financing | Availability | Seller's Page |
|---|---|---|---|---|---|---|---|---|---|---|
|
BEST PRICE 1 Product Purchase
|
|
$39.99 | $39.99 |
|
$39.99 | See Site | In stock | Visit Store |
Reviews
Questions & Answers
Ortung mit elektrischen und Ultraschallwellen in Technik und Natur. Die ferromagnetischen Werkstoffe
$59.99
Symmetry in Mechanics
$59.99
Recent Advancement in White Biotechnology Through Fungi
$109.99
Introductory Medical Imaging
$29.99
Advances in Nonlinear Speech Processing
$54.99
Global Rage After the Cold War
$54.99
Praxis und Theorie der Individual-Psychologie
$74.99
Umwandlungssteuerrecht
$34.99
Kompressoren-Anlagen
$59.99
Bad Kitty
$5.21
Conceptual Modeling -- ER 2003
$109.99
The Five Senses in Nabokov's Works
$109.99
Astronomy and Big Data
$109.99
Global Events and Event Stratigraphy in the Phanerozoic
$84.99
Big Data Factories
$39.99
konomische Relevanz von Kommunikationsqualitt in elektronischen Verhandlungen
$69.99
Gleichgewichtsthermodynamik
$74.99
Data Assimilation
$149.00
konomie im Quartier
$59.99
Topics in Nonlinear Dynamics, Volume 1
$169.00
Childrens Food
$129.00
Die Oberflchenhrtung
$59.99
Politische Geschichte der Gegenwart
$59.99
Optimization and Games for Controllable Markov Chains
$159.99
Wirtschaftsgeologie
$54.99
The War Within
$169.99
Structure Determination by X-Ray Crystallography
$54.99
Intelligent Techniques in Signal Processing for Multimedia Security
$169.99
Resource-Adaptive Cognitive Processes
$129.00
Advances in National Brand and Private Label Marketing
$109.99
Multidisciplinary Treatment of Soft Tissue Sarcomas
$169.00
Der Balkenmangel
$69.99
Arthritis Research
$84.99
Watch Your Back- Nine Proven Strategies to Reduce Your Neck and Back Pain Without Surgery by Ken Hansraj Md
$27.99
My Two Border Towns
$5.96
Computer Aided Systems Theory EUROCAST 2019
$39.99
Earths Magnetospheric Processes
$74.99
Management von Fuballstadien als Veranstaltungsimmobilien
$59.99
Mathematik fr Wirtschaftswissenschaftler kompakt
$29.99
E-Venture-Management
$59.99
