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The Relational Data Model and Relational Database Constraints

Slide 5- 2. Chapter Outline. Relational Model ConceptsDefinitionsCharacteristics of relationsRelational Model Constraints and Relational Database SchemasKey constraintsEntity integrity constraintsReferential integrity constraints. Slide 5- 3. Relational Model. A Relation is a mathematical con

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The Relational Data Model and Relational Database Constraints

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    1. Chapter 5 The Relational Data Model and Relational Database Constraints

    2. Slide 5- 2 Chapter Outline Relational Model Concepts Definitions Characteristics of relations Relational Model Constraints and Relational Database Schemas Key constraints Entity integrity constraints Referential integrity constraints

    3. Slide 5- 3 Relational Model A Relation is a mathematical concept based on the ideas of sets The model was first proposed by Dr. E.F. Codd of IBM Research in 1970 in the following paper: "A Relational Model for Large Shared Data Banks," Communications of the ACM, June 1970 The above paper caused a major revolution in the field of database management and earned Dr. Codd an ACM Award

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