DBMS-Entity Relationship (E-R) Model

DBMS-Entity Relationship (E-R) Model
1. E-R model was first introduced by Dr. E.F. Codd.
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2. E-R modelling is a high-level conceptual data model developed to facilitate database design.
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3. E-R model is dependent on a particular database management system (DBMS) and hardware platform.
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4. A binary relationship exists when an association is maintained within a single entity.
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5. A weak entity type is independent on the existence of another entity.
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6. An entity type is a group of objects with the same properties, which are identified by the enterprise as having an independent existence.
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7. An entity occurrence is also called entity instance.
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8. An entity instance is a uniquely identificable object of an entity type
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9. A relationship is an association among two or more entities that is of interesdt to the enterprise.
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10. The participation is optional if an entity's existence requires the existence of an associated entity in a particular relationship.
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