Chapter 6 - ENTITY RELATIONSHIP - DIGRAM
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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.
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Chapter 7 -DATABASE DESIGN AND TABLE STRUCTURE
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