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Abstract
In this paper, we consider semantics of data in databases with incomplete information as a pair S=(r, a), where r is a relation with null values and a is an assignment of every tupe t in r to a set of objects in the real world. Some relationships between a database and the real world are also examined.
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PDF (Tiếng Việt)DOI: https://doi.org/10.15625/1813-9663/11/2/8131
Journal of Computer Science and Cybernetics ISSN: 1813-9663
Published by Vietnam Academy of Science and Technology