Computers and Technology, 15.07.2021 17:40 lil2524
Cho quan hệ R trên tập thuộc tính U = (ABCDEGHIJ) và tập phụ thuộc hàm F = { A -> BC, E -> GC, B -> EH, AC -> I, GD -> AH, D->JG}
a, tìm bao đóng của tập thuộc tính {AD}
b, tìm tất cả khóa tối thiểu của R
c, tìm tập phụ thuộc hàm tối thiểu F* của F
d, chuẩn hóa quan hệ về 3NF
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Cho quan hệ R trên tập thuộc tính U = (ABCDEGHIJ) và tập phụ thuộc hàm F = { A -> BC, E -> GC,...
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