CHAPTER 4.5 -:ENTITY RELATIONSHIP - DIGRAM

An E R diagram is a model that identifies the concept or entities that exist in a system and the relationships between those entities. An ERD is often used as a way to visualize a relational database: each entity represents a database table and the relationship lines represents the key in one table that point to specific records in related tables.

Advantages of ER diagram

· Professional and faster Development.

· Productivity Improvement.

· Fewer Faults in Development.

· Maintenance becomes easy.