EER Enhanced Entity Relationship Model Chapter 4.1-4.3

Feb 22, 2012

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Why EER?. There are limitations to the ER modelER model enhanced (EER) to include:

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EER Enhanced Entity Relationship Model Chapter 4.1-4.3

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Enhanced Entity-Relationship Modeling

Enhanced Entity-Relationship Modeling. Strong and Weak Entity Types. Strong entity: Each object is uniquely identifiable using primary key of that entity type. Weak entity: Each object cannot be uniquely identified using only the attributes associated with that entity type.

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Chapter 4: Enhanced Entity-Relationship (EER) Modeling

Chapter 4: Enhanced Entity-Relationship (EER) Modeling. Data Modeling and Database Design. Remember!. Presentation Layer ER Diagram  C ontains hashes and oval Design-specific ER Diagram (Coarse-granularity)  Uses (min, max) notation  Maps deletion rules

752 views • 43 slides

MODEL EER (ENHANCED ENTITY RELATIONSHIP)

MODEL EER (ENHANCED ENTITY RELATIONSHIP). Model EER . Model entity Relationship yang ditambah kemampuan semantiknya dengan beberapa konsep yang lebih kompleks . Subclass Superclass Generalization Specialization Specialization Hierarchy Specialization lattice Attribute Inheritance

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Enhanced Entity-Relationship (EER) Modeling

Enhanced Entity-Relationship (EER) Modeling. Introduction. The term Enhanced Entity Relationship (EER) model refers to the extension of the original ER model Why do we need EER Model ? Which concepts and relationships cannot be captured by ER Model ?. Supertype /Subtype relationships.

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Chapter 2: Entity-Relationship Model

Chapter 2: Entity-Relationship Model. Entity Sets Relationship Sets Design Issues Mapping Constraints Keys E-R Diagram Extended E-R Features Design of an E-R Database Schema Reduction of an E-R Schema to Tables. Entity Sets. A database can be modeled as: a collection of entities,

1.11k views • 73 slides

MODEL EER (Enhanced Entity Relationship)

MODEL EER (Enhanced Entity Relationship). Bertalya Program SarMag, Universitas Gunadarma 2008. KONSEP MODEL EER. Model Enhanced Entity Relationship (EER) = Model Entity Relationship (ER) + konsep spesialisasi, generalisasi dan kategorisasi. KONSEP MODEL ER.

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Chapter 8 The Enhanced Entity-Relationship (EER) Model

Chapter 8 The Enhanced Entity-Relationship (EER) Model. Chapter 8 Outline. Subclasses, Superclasses, and Inheritance Specialization and Generalization Constraints and Characteristics of Specialization and Generalization Hierarchies Modeling of UNION Types Using Categories.

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MODEL EER (Enhanced Entity Relationship)

MODEL EER (Enhanced Entity Relationship). Universitas Gunadarma 2013. KONSEP MODEL EER. Model Enhanced Entity Relationship (EER) = Model Entity Relationship (ER) + konsep spesialisasi, generalisasi dan kategorisasi. KONSEP MODEL ER.

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Chapter 4 Extended Entity-Relationship (EER)Model

Chapter 4 Extended Entity-Relationship (EER)Model. Incorporates Set-subset Relationships Incorporates Generalization Hierarchies Constraints: Coverage Constraints: partial vs. total Disjointedness Constraint: disjoint vs. overlapping. Limitations of ER Models.

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Set 12 Chapter 8 Enhanced Entity-Relationship (EER) Model and Chapter 9.2 mapping EER to relations

Set 12 Chapter 8 Enhanced Entity-Relationship (EER) Model and Chapter 9.2 mapping EER to relations. Chapter 8 Outline. Subclasses, Superclasses , and Inheritance Specialization and Generalization Constraints and Characteristics of Specialization and Generalization Hierarchies

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Chapter 8 The Enhanced Entity-Relationship (EER) Model

Chapter 8 The Enhanced Entity-Relationship (EER) Model. The Enhanced Entity-Relationship (EER) Model. Enhanced ER (EER) model Created to design more accurate database schemas Reflect the data properties and constraints more precisely More complex requirements than traditional applications.

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Objektorientering i ER-modeller EER-modeller Enhanced Entity Relationship Models

Objektorientering i ER-modeller EER-modeller Enhanced Entity Relationship Models. Oppsummering: Å oversette fra ER- til relasjonsmodell side 2 Spesialisering og generalisering side 3-6 Komposisjon side 7 Aggregering side 8. Se ellers læreboka, side 199-212.

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Chapter 7: Entity-Relationship Model

Chapter 7: Entity-Relationship Model. Chapter 7: Entity-Relationship Model. Design Process Modeling Constraints E-R Diagram Design Issues Weak Entity Sets Extended E-R Features Design of the Bank Database Reduction to Relation Schemas Database Design UML. Modeling.

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Chapter 4 The Enhanced Entity-Relationship (EER) Model

Chapter 4 The Enhanced Entity-Relationship (EER) Model. Dr. Bernard Chen Ph.D. University of Central Arkansas. EER Model.

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Chapter 7: Entity-Relationship Model

Chapter 7: Entity-Relationship Model. When All We Want Is an ER Diagram. Design Process Modeling Constraints E-R Diagram Design Issues Weak Entity Sets Extended E-R Features Design of the Bank Database Reduction to Relation Schemas Database Design UML. Input: Plain Text.

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4.1 The Entity-Relationship Model

4.1 The Entity-Relationship Model. Design phrase 1) What information will be stored 2) How information elements will be related to one another 3) What constraints may be assumed (See Fig. 4.1) High-level models: 1) E/R (Entity/Relationship) diagram

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Entity-Relationship Model and Enhanced Entity-Relation Model

Entity-Relationship Model and Enhanced Entity-Relation Model. Outline. Data Models Notation basics Understanding types of relationship Generalization/Specialization hierarchies. Data Models.

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CHAPTER 4 Enhanced Entity-Relationship (EER) Modeling

CHAPTER 4 Enhanced Entity-Relationship (EER) Modeling. Chapter Outline. EER stands for Enhanced ER or Extended ER EER Model Concepts Includes all modeling concepts of basic ER Additional concepts: subclasses/superclasses specialization/generalization categories (UNION types)

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Chapter 8 The Enhanced Entity-Relationship (EER) Model

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Chapter 2: Entity-Relationship Model

Chapter 2: Entity-Relationship Model. Chapter 2: Entity-Relationship Model. Design Process Modeling Constraints E-R Diagram Design Issues Weak Entity Sets Design of the Bank Database Reduction to Relation Schemas Database Design UML. Modeling. A database can be modeled as:

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Chapter 2: Entity-Relationship Model

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ENHANCED ENTITY-RELATIONSHIP (EER) MODEL – 1

ENHANCED ENTITY-RELATIONSHIP (EER) MODEL – 1. - Objectives. Introduction to EER Modeling + Concepts of the EER Model + Specialization + Generalization + Constraints on Specialization/Generalization (S/G) + S/G Notation Summary +. - Introduction to EER Model.

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