While cardinality specifies the occurrences of a relationship, ordinality describes the relationship as either mandatory or optional. Ordinality is also closely linked to cardinality. In relationship to databases and ERD, cardinality specifies how many instances of an entity relate to one instance of another entity. It can be one-to-one, many-to-one, or many-to-many.Ĭardinality is the mathematical sense just means the number of values in a set.
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