Cardinality (data modeling)
Numerical relationship among rows in different tables / From Wikipedia, the free encyclopedia
For other uses, see Cardinality (disambiguation).
Within data modelling, cardinality is the numerical relationship between rows of one table and rows in another. Common cardinalities include one-to-one, one-to-many, and many-to-many. Cardinality can be used to define data models as well as analyze entities within datasets.