Về các quan hệ tối giản ở dạng không chuẩn một

Trần Thái Sơn

Abstract



In this paper the propreties of the nest and unnest operations of Non-First normal form Relations (NFR) are discussed. Some necessary and sufficient conditions, under which a collection of irreducible relations and a collection of canonical relations over a set of attributes E = {E1, E2} are identified, are proposed.


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Journal of Computer Science and Cybernetics ISSN: 1813-9663

Published by Vietnam Academy of Science and Technology