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$^^$ Show the following rule for MVD\'s. The attributes are arbitrary sets X, Y,

ID: 3940374 • Letter: #

Question

$^^$

Show the following rule for MVD's. The attributes are arbitrary sets X, Y, Z and the other unnamed attributes of the relation in which these dependencies hold. The Difference Rule. If X, Y, and Z are sets of attributes, X rightarrow rightarrow Y, and X rightarrow rightarrow Z, then X rightarrow rightarrow (Y-Z). Show the following rule for MVD's. The attributes are arbitrary sets X, Y, Z and the other unnamed attributes of the relation in which these dependencies hold. Removing attributes shared by left and right side. If X rightarrow rightarrow Y holds, then X rightarrow rightarrow (Y-X) holds.

Explanation / Answer

Q12)

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$^^$ Suppose R is a relation with attributes A_1, A_2, ..., A_n As a function of

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