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Relationship Participation

20 October, 2015 - 10:43

There are two sides to each of the relationships when it comes to participation. Each side can have two options for participation. It is either 0 (zero), 1 (one), or many. The outer most symbol represents the con nectivity. i.e. one to many would be represented by

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The inner most symbols represent the cardinality which indicates the minimum number of instances in the corresponding entity. i.e. on the right hand side it is read as: minimum 1 maximum many. On the left hand side it’s read as minimum 1 and maximum 1. See below for more examples.

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