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The number of unique values for an attribute or key in a relation to the total number is called cardinality.
True
False
Cardinality within a relation is the ratio of unique values to the total number of values. https://www.techopedia.com/definition/18/cardinality-databases. NOTE: (7/5/2016) Cardinality also refers to the degrees of relationship between entities. http://www.sqa.org.uk/e-learning/SoftDevRDS02CD/page_44.htm
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