Explore the fundamental concepts of entities and relationships in database design through this comprehensive 40-minute lecture. Delve into topics such as the degree of relationships, diagrammatic notations, binary relationships, cardinality ratios, participation constraints, and structural constraints. Learn to differentiate between various cardinality ratios, including one-to-one, many-to-one, one-to-many, and many-to-many relationships, with practical examples. Examine the importance of total and partial participation constraints, compare different notations, and understand the use of attributes in relationship types. Conclude by investigating recursive relationships and the significance of role names in database modeling.
Entities and Relationships in Database Design
Overview
Syllabus
Intro
Degree of a relationship
Diagrammatic Notation for Relationships
Binary Relationships and Cardinality Ratio
Cardinality Ratios
Cardinality Ratio - example (one-to-one)
Cardinality Ratio - example (many-to-one/one-to-many)
Cardinality Ratio - example (many-to-many)
Participation Constraints
Example of total/partial Participation
Structural Constraints.
Comparing the Notations
Attributes for Relationship Types - More Examples
Recursive Relationships and Role Names
Taught by
NPTEL-NOC IITM
