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cardinality

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A quantity relationship between elements. For example, one-to-one, one-to-many and many-to-one express cardinality. See cardinal number.

(mathematics)cardinality - The number of elements in a set. If two sets have the same number of elements (i.e. there is a bijection between them) then they have the same cardinality. A cardinality is thus an isomorphism class in the category of sets.

aleph 0 is defined as the cardinality of the first infinite ordinal, omega (the number of natural numbers).
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For example, counting requires mastery of the principles of one-to-one correspondence, stable order, cardinality, and abstraction.
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Information about how the entities relate, in particular, the optionality and cardinality of the relationship is modeled.
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Significant performance gains have resulted from improved JOIN cardinality estimates, faster processing of complex queries and enhanced table scan performance.
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