Mathematics, 24.06.2021 17:20 brenyasanders6238

Cho lược đồ quan hệ R(ABCDEI) và tập phụ thuộc hàm: F=\DAB=E. BI = ECDIE→c xác dịnh trên R. Chứng minh rằng: AB → ECD theo hai cách:

a. Cách 1: Dựa vào tính chất của hệ tiên đề Armstrong
b. Cách 2: Sử dụng bao dóng.

Answers: 2

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Cho lược đồ quan hệ R(ABCDEI) và tập phụ thuộc hàm: F=\DAB=E. BI = ECDIE→c xác dịnh trên R. Chứng m...