Engineering, 19.12.2019 19:31 Fireburntbudder
Let r be a relation, x a set of attributes of r, and a an attribute of r. (also, denote by xa the result of adding a to x.) define the support of x, written #x, as the number of distinct tuples in r|x (r restricted to, or projected onto, the attributes of x). prove that if x→a, then #x=#xa.
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Let r be a relation, x a set of attributes of r, and a an attribute of r. (also, denote by xa the re...
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