What are the levels of schema?

Question

There are mainly three levels of data abstraction: Internal Level: Actual PHYSICAL storage structure and access paths. Conceptual or Logical Level: Structure and constraints for the entire database. External or View level: Describes various user views.

What are the three levels of schema?

External/ View level. This is the highest level of database abstraction. It includes a number of external schemas or user views. ... Conceptual or Logical level. This level describes the structure of the whole database. ... Internal or Physical level. This is the lowest level of database abstraction.

What are the 3 levels in 3 schema architecture?

The three levels present in this architecture are Physical level, Conceptual level and External level.

What is schema and its types?

Definition of schema: Design of a database is called the schema. Schema is of three types: Physical schema, logical schema and view schema. For example: In the following diagram, we have a schema that shows the relationship between three tables: Course, Student and Section.

What are the 3 levels of data abstraction?

Levels of abstraction for DBMSPhysical or Internal Level.Logical or Conceptual Level.View or External Level.

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