Phụ Thuộc Boolean Dương Đa Trị Trong Mô Hình Dữ Liệu Dạng Khối

Abstract

The report proposed the concept of multivalue positive Boolean dependencies in the database model of block form, proved the sufficient properties of the functions I,  and , equivalence of three types derived: logically m-derived, m-derived by block, m-derived by block not exceeding two elements, the necessary and sufficient criteria of the tight expression for the set of multivalue positive Boolean dependencies... In addition, the properties related to this concept while the block degenerate into relationship has been stated and proved here.