Chapter 3 The Relational Model.

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Presentation transcript:

Chapter 3 The Relational Model

Agenda Concept Property Key Integrity Constraint Base Relation & View

Concept Relation Attribute Domain Tuple Degree Cardinality Relational Database

Property Unique relation name Unique attribute No duplication tuples No repeating group (single value for an attribute) Same domain for an attribute Insignificance of the tuples or attributes order

Key Superkey Candidate key (Alternative key) Primary key Foreign key

Integrity Constraint Null Integrity constraint Entity Reference Domain (edit or field) Enterprise (business rule)

Base Relation & View Base relation View Purpose of views A named relation of an entity in conceptual schema Tuples stored in physical database View Virtual relation Dynamic generated for end user Not stored in the physical database Purpose of views Security User friendly report Performance

Points To Remember Concept Property Key Integrity Constraint Base Relation & View

Assignment Review chapters 1-3, & appendix c Read Chapter 4 (skip relational calculus 4.2) Do Exercise 3.8 Due date: