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Nguyễn Cát Hồ, Lê Thế Thăng


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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Journal of Computer Science and Cybernetics ISSN: 1813-9663

Published by Vietnam Academy of Science and Technology