Ngữ nghĩa của dữ liệu trong cơ sở dữ liệu với thông tin không đầy đủ

Nguyễn Cát Hồ, Lê Thế Thăng

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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Journal of Computer Science and Cybernetics ISSN: 1813-9663

Published by Vietnam Academy of Science and Technology