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Entity Relationships

After identification of entities and their attributes, the next stage in ER data modeling is to identify the relationships between these entities.

We can say a relationship is any association, linkage, or connection between the entities of interest to the business. Typically, a relationship is indicated by a verb connecting two or more entities. Suppose there are two entities of our library system, member and book, then the relationship between them can be “borrows”.

Member borrows book

Each relationship has a name, degree and cardinality. These concepts will be discussed next.

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