Các phụ thuộc yếu trong mô hình dữ liệu quan hệ

Vu Duc Thi, Nguyen Kim Anh
Author affiliations

Authors

  • Vu Duc Thi Publishing House for Science and Technology
  • Nguyen Kim Anh

DOI:

https://doi.org/10.15625/1813-9663/6/4/11151

Abstract


One of  the main concepts in relational database theory is the full family of functional dependencies, that was first axiomatized by W.W.Armstrong [1].

The full family of weak dependencies have also been introduced and axiomatized [4, 5].

In this paper, we give some new results about weak dependencies. We give a necessary and sufficient condition for W+R = W+, and then we construct an effective combinatorial algorithms to  determine irredundant relation R’ for an arbitrary given relation R such that R’ Í R, W+R’ = W+R.

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Published

30-01-2018

How to Cite

[1]
V. D. Thi and N. K. Anh, “Các phụ thuộc yếu trong mô hình dữ liệu quan hệ”, JCC, vol. 6, no. 4, p. 27–32, Jan. 2018.

Issue

Section

Computer Science

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