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Functional Dependencies (FDs)

Functional Dependencies (FDs). Let r(R) be a relation and let t ? r, then the restriction of t to X ? R, written t[X], is the projection of t onto X. BC ? ABC t[BC] = <2, 5> = {(B:2), (C:5)}. R(A B C) 1 2 3 2 2 5 2 3 5 4 4 5. r =. t =.

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Name city roomnr - PowerPoint PPT Presentation

Functional Dependencies (FDs)