Entity Relationship Model Understanding
An good Entity Relationship Model (ERM) is definitely an abstract as well as conceptual representation of data. Entity-relationship modeling is really a database modeling method, utilized to make a kind of conceptual schema or semantic data model of a system, normally a relational database and its requirements in a top-down fashion. Diagrams developed by this method tend to be known as entity relationship diagrams, ER diagrams, or ERDs.
We use an Entity Relation Model (ERM) to produce a data model of a system and its requirements in a top-down approach. This really is frequently the approach utilized in database design. The actual diagrams which emerge from this methodology are known as ER diagrams.
Structured data is represented by an Entity Relationship Model (ERM). Entity Relationship Modeling may be the the model-generating process. The actual end-product from the modeling process is an entity-relationship diagram (ERD) or ER diagram, a kind of Conceptual Data Model or Semantic Data Model.
The Enhanced Entity Relationship (EER) model is really a high-level or conceptual data model incorporating extensions to the original entity-relationship (ER) model, used in the design of databases. It was developed to reflect more precisely the properties and constraints that are found in more complex databases, such as in engineering design and manufacturing (CAD/CAM), telecommunications, complex software systems and Geographic Information Systems (GIS).
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