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Customer Relationship Management: Getting It Right! by Judith W. Kincaid

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D.6. Relationship Types

Our job, should we chose to accept it (and we must accept it), is to determine which entities have relationships with each other, the role or name of the relationship, and the cardinality of each end. Business rules provide the guidance that helps make these determinations.

A company may be engaged in only one industry, but an industry describes many companies. This is called a one-to-many relationship and is the most common. In this type of relationship, one entity is said to be dependent on the other because the correct entity instance is based on knowing the specific record from the other (independent) entity. We know that entities represent a group of attributes; a dependent entity represents a group of that all together ...

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