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Cardinality (data modeling)

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In computer engineering, the cardinality of one data table with respect to another data table is a critical aspect of database design. If a hospital designs it own database and has separate data tables keeping track of doctors and patients, there might be a many-to-one relationship between records in the doctor table and records in the patient table. Whether data tables are related as many-to-many, many-to-one, or one-to-one is said to be the cardinality of a given database design.

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