Database Management System20785 marksData models, schemas, and instances
Explain Data Models, Schemas, and Instances.
Explain Data Models, Schemas, and Instances. [5]
A data model is a collection of concepts or tools used to describe the structure of a database. It provides a way to describe the design of a database at logical, physical, and view levels. Data models define: - The data itself - Relationships among data - Semantics (meaning) of data - Constraint...