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What Are Cardinalities?

Answer»

Cardinality expresses the minimum and maximum number of instances of an ENTITY B that can be associated with an instance of an entity A. The minimum and the maximum number of instances can be equal to 0, 1, or N.

Because a join represents a bi-directional relationship, it must always have two cardinalities.

There are two main METHODS for detecting or editing cardinalities:

  • The Detect Cardinalities command
  • The Edit Join dialog box

Cardinality expresses the minimum and maximum number of instances of an entity B that can be associated with an instance of an entity A. The minimum and the maximum number of instances can be equal to 0, 1, or N.

Because a join represents a bi-directional relationship, it must always have two cardinalities.

There are two main methods for detecting or editing cardinalities:


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