For a single occurrence of one entity (one customer), cardinality defines the maximum and minimum number of occurrences that might relate to the other entity (sales orders).

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Cardinality is a relationship between two entities, where it defines the maximum and minimum number of occurrences of one entity that can relate to the other entity. For example, in a sales system, the cardinality between customers and sales orders might be one-to-many, where one customer can have many sales orders, but a sales order can only belong to one customer. Therefore, for a single occurrence of one entity (one customer), cardinality defines the range of possible occurrences that might relate to the other entity (sales orders).

For a Single Occurrence of One Entity (One Customer), Cardinality