The Entity Relationship Diagram.

The Entity Relationship Diagram (ERD) depicts a abstract data gratuity that incorporates some of the important scientific information about the real(a) world. It adopts a natural view that the real world consists of entities and dealing (Chen, 1976). integrity objective of the ERD is to create a simple, easy to regard and hands down presented data illustration consisting of entities, attributes, relationships and cardinalities. The exemplar serves as apparatus for database soma, where the baby-sit can facilitate communication between the establishment analyst or designer and the end-user during the requirement analysis and conceptual design phases. Chen published one of the first articles on the entity-relationship model in 1976 at a database conference (Chen, 1976). The concept of entity-relationship already existed for years in the field of philosophy and began to be call to database design heavily between 1975 and 1980. In 1979, there was a conference on the entity-relationship model during the First International conference on Entity-Relationship Approach in Los Angeles, California. Annual conferences on the committal to writing continued until 1995, when the conference was renamed the International Conference on abstract Modeling (AICCM, 2003). The entity-relationship model is the result of the unification of the hierarchical, network and relative models for developing a logical database design.

One important purpose of the entity-relationship model was to have a database model that was independent of the remedy database management systems. An entity is defined as a person, place or thing in the real world or is conceptual, hea rty existing in someones mind. An entity th! at is specific is similar to an object instantiation of a class. Entity typefaces are a more powerful and concise agency of entities. An entity type is a collection of entities that share a set lot definition. For example, an entity may be a Ford car, whereas an entity type could... If you hope to get a full essay, order it on our website: OrderEssay.net

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