*noun* (mathematics) the number of elements in a set or group (considered as a property of that grouping)

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cardinality A reference to a set, the cardinal number indicating the number of elements in the set.

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*[SQL statements]* In SQL (Structured Query Language), the term cardinality refers to the uniqueness of data values contained in a particular column (attribute) of a database table. The lower the cardinality, the more duplicated elements in a column. Thus, a column with the lowest possible cardinality would have the same value for every row.

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*[data modeling]* In database design, the cardinality or fundamental principle of one data table with respect to another is a critical aspect. The relationship of one to the other must be precise and exact between each other in order to explain how each table links together. In the relational model, tables can be related as any of `one to man

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In mathematics, the cardinality of a set is a measure of the `number of elements of the set`. For example, the set A = {2, 4, 6} contains 3 elements, and therefore A has a cardinality of 3. There are two approaches to cardinality – one which compares sets directly using bijections and injections, and another which uses cardinal numbers. The ca..

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http://en.wikipedia.org/wiki/Cardinality

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