DBMS 3 Level Architecture, ER Model ( Specialization Generalization and Aggregation)
Channel: NETCracker CBSE NET/ GATE Computer Sc.
Date: 29/11/2017

DBMS 3 level Architecture or DBMS 3 tier architecture helps in data abstraction with 
External level:-application view defined by user
Conceptual level:-represents entire data base with the help of conceptual schema. 
Internal level  :- close to physical storage,how data is stored and which data structure is used and how to access data.
Entity Relationship Diagram
Specialization Generalization and Aggregation
Jan 2017 CBSE NET question  solution

DBMS 3 tier Architecture, External View, Conceptual View, Internal View, DBMS Architecture, ER model, entity relationship

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