Chapter No 3 ⦁ Semantic Data Model ⦁ Relational Model ⦁ Database Models and Internet Semantic Data Model: "A semantic data model is a method of organizing data in a logical and meaningful way. " It provides a conceptual representation of data and the relationships between them, adding a layer of semantic information that gives data a basic meaning. Key Elements: 1. - Entities: Represent objects or concepts (e.g., Person, Product). 2. - Attributes: Characteristics or properties of entities. 3. - Relationships: Connections between entities, defining associations through the foreign key. A semantic data model describes data about its real-world interpretation and usage. For example, the object "Person" can be generalized to include "Employee," "Applicant," and "Customer," and is related to "Project" and "Task." A person can own multiple projects, and a specific task can be associated with differe...
Comments
Post a Comment