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Query reflects a real-world situation. Unary Relationships recursive A unary relationship is when both participants in the relationship are the same entity.
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Designing a database real-world modelling.
. One in which a relationship exists between occurrences of the same. Given below is another example of ER. In the above example Entities Employee.
The Entity-Relationship E-R Model 1. Entity-Relationship E-R Model Agenda Characteristics of E-R Model Components of E-R Model Example of E-R Model Enhanced E-R Model Characteristics of E-R Model Semantic data model. Loan status of a book entity-relationship model of an enterprise.
Chapter 2Entity-Relationship Model Entity Sets Relationship Sets Design IssuesMapping ConstraintsKeys E-R Diagram Extended E-R Features Design of an E-R. The relationships among entities define the logical association between entities.
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