3 MODELLING MORE COMPLEX RELATIONSHIPS
This chapter explores some of the more complex relationships that can exist between entity types and object classes. The topics covered are the resolution of many-to-many relationships and associations (including the oddity known as the ‘Bill of Materials’ structure), mutually exclusive relationships and associations, which lead to generalisation and specialisation, and, finally a quick look at aggregation and composition.
THE PROBLEMS WITH MANY-TO-MANY RELATIONSHIPS AND ASSOCIATIONS
Although many-to-many relationships and associations are legitimate constructs to have on a model, they can pose a problem as they may be hiding some important information that the business should be interested in recording. ...
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