An Approach to Handling Incomplete Information in Databases
نویسندگان
چکیده
منابع مشابه
Incomplete Information in Multidimensional Databases
Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. ABSTRACT While incomplete information is endemic to real-world data, current multidimensional data models are not engineered to manage incomplete information in base data, derived data, and dimensions. This chapter presents several strategies for ma...
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We consider query processing in deductive databases with incomplete information in the form of null values. We motivate the problem of extracting the maximal information from a (deductive) database in response to queries, and formalize this in the form of conditional answers. We give a sound and complete top-down proof procedure for generating conditional answers. We also extend the well-known ...
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For the conventional relational model there has been considerable research in the area of incomplete information. On the other hand, research in temporal databases has concentrated on models in which complete historical information is needed. However, the likelihood of missing information in temporal databases is greater because of the vast amount of information. Hence, a mechanism must be prov...
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Two of the major problems raised by information incompleteness in databases are how to evaluate queries and how to take data dependencies into account. We give a unified solution of these two intermingled problems for the relational model. Formal criteria for the correctness of the relational algebra and dependency satisfaction are presented. We give a correct redefinition of the complete relat...
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Efficient handling of inexact (grey) information is an important issue for the new emerging database technology. Inexact or imprecise information has been represented and manipulated by using different techniques, including fuzzy set theory, possibility theory, IVF (Interval Valued Fuzzy) Sets, Time Petri Nets, Fuzzy Clouds, etc. In this paper, different approaches dealing with uncertainty have...
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ژورنال
عنوان ژورنال: The Computer Journal
سال: 1988
ISSN: 0010-4620,1460-2067
DOI: 10.1093/comjnl/31.2.133