The Entity Relationship Diagram.

The Entity Relationship Diagram (ERD) depicts a filch data give 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). maven objective of the ERD is to create a simple, easy to regard and conveniently presented data illustration consisting of entities, attributes, relationships and cardinalities. The good example serves as apparatus for database heading, where the pose 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 go for to database design heavily between 1975 and 1980. In 1979, there was a conference on the entit y-relationship model during the First International company on Entity-Relationship Approach in Los Angeles, California. Annual conferences on the formation 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 proportional models for developing a logical database design.

One important life of the entity-relationship model was to have a database model that was independent of the hearten database management systems. An entity is defined as a person, place or thing in the real world or is conceptual, self-colored existin g in someones mind. An entity that is speci! fic is similar to an object instantiation of a class. Entity casefuls are a more powerful and concise delegation of entities. An entity type is a collection of entities that share a lay 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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