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DBMS BCA Unit-2 ER Model - Introduction Components of an E-R Model Entity Entity Identifier: Key Attributes Strong and Weak Entity Sets Attributes and Domain Types of Attributes Relationships E-R DIAGRAM ERD for STUDENT Entity ERD for CAR Entity Entity Types for a COMPANY Database Relationship Types of COMPANY Database THE RELATIONAL MODEL Structure of Relational Databases Super Keys and Candidate Keys Relational Constraints Database Operations and Constraint Violations


E-R DIAGRAM

Entity-Relationship diagrams are composed of:
  • Rectangles - representing entity sets.
  • Ellipse - representing attributes.
  • Diamonds - representing relationship sets.
Database Management System

Database Management System

Database Management System