DBMS: Concept of Relationships in ER Diagram Topics discussed: 1. Definition of Relationship & example. 2. Degree of Relationship: a. Unary relationship b. Binary relationship c. Ternary relationship 3. Relationship Constraints a. Cardinality Ratio (one to one, one to many, many to one & many to many). b. Participation Constraints (Total & partial participation). 4. ER Diagram for COMPANY database. 5. Attributes of Relationship Types. 6. Role Names & Recursive Relationships. 7. Alternative Notations for ER Diagrams. 8. Enhanced ER (EER) Model: a. Generalization b. Specialization