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Documents Levels of Abstraction in DBMS data * Schemas are defined using DDL; data is modified/queried using.....

Slide 1 Slide 2 Levels of Abstraction in DBMS data * Schemas are defined using DDL; data is modified/queried using DML. – Views describe how users see data (possibly different…

Documents 1 Chapter 4 Database Design I: The Entity-Relationship Model.

Slide 1 1 Chapter 4 Database Design I: The Entity-Relationship Model Slide 2 2 Database Design Goal: specification of database schema Methodology: E-R model –Use E-R model…