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If W, X, Y and Z are attributes of a relation, which of the following inference rules for functional dependencies is/are correct? (a) If
If W, X, Y and Z are attributes of a relation, which of the following inference rules for functional dependencies is/are correct? (a) If X Y then Y X (b) If X Y then (X, Z) (Y,W) (c) If X(Y,Z) then X Y (d) If (X, Z) Y then XY and Z Y (e) If X Y and X Z then X (Y,Z) Select one or more: O A. (a) OB. (b) C. (d) O D. (e) O E. (C)
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Fundamentals Of Database Systems
Authors: Ramez Elmasri, Shamkant Navathe
7th Edition
0133970779, 978-0133970777
