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Entity Relationships

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.

See Also

• Data Modeling and Data Requirements
• E-R Data Modeling Technique
• E-R Model concept, Entities and Attributes
• Types of Attributes
• Entity Types
• Value Sets (domain) of Attributes
  
• Entity Relationships
  Degree of an Entity Relationship Type
  
• Designing basic model and E-R Diagrams
  E-R diagrams constructs
  E-R Diagram for library management system

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