semantic data model in DBMS pdf
Semantic Data Model in DBMS pdf: Semantic Object Model introduction: The semantic object model is a logical representation of data in an organization. It views the entire computer network system as a collection of objects related to one another. The semantic object model takes semantic objects as the basic element. It is based on the concepts presented by Codd engineer. It was first presented in 1988. The semantic object model can represent the perceptions of the users more closely than the E-R model. Semantic Objects: A semantic object is a thing that can be identified in the user's working environment. Semantic means "meaning". Semantic objects are used to represent or model the meaning of the user's data. Semantic objects are grouped into classes. Each object has a unique name. For example, different classes in a university are STUDENT, Teacher, and DEPARTMENT, etc. A particular semantic object is known as an instance of the STUDENT class, "Abdullah" ...