Advance Database Technique Practicals MCa Idol | Practicals | Bhandup Shree Ram
Advance database system(part 6)
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Advance Database Systems Enhanced Entity Relationship Diagrams (EERD)
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Transcript of Advance database system(part 6)
![Page 1: Advance database system(part 6)](https://reader033.fdocuments.us/reader033/viewer/2022051521/5a64f7bd7f8b9aa2548b5225/html5/thumbnails/1.jpg)
Advance Database SystemsEnhanced Entity Relationship Diagrams (EERD)
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Contents
• Enhanced Entity Relationship Diagrams (EERD)
• Sub Type and Super Type Relationships
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Enhanced Entity Relationship Diagrams (EERD)
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Sub Type and Super Type Relationships
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Basic Concept and Notation
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Attribute Inheritance
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When to use Supertype/Subtype Relationships
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Representing Specialization and Generalization
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Specialization
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Specifying Constraint in Sub Type/Super Type Relationships
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Total Specialization/Partial Specialization Rule
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Specifying Disjointness Constraints
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Disjoint Rule/Overlap Rule
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Defining Subtype Discriminators
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Disjoint Subtype
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Defining Super Type/Sub Type Hierarchies
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