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Using Armstrong’s axioms of functional dependency derive the following rules:

$\{ x \rightarrow y. \: wy \rightarrow z \} = xw \rightarrow z$

(Note: $x \rightarrow y$ denotes $y$ is functionally dependenet on $x$, $z \subseteq y$ denotes $z$ is subset of $y$, and $\mid =$ means derives).
asked in Databases by Veteran (73.2k points)   | 13 views

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