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Lab 3 Alternative ER Modelling Pearson Education © 2009
2 ER Modeling u We learned how to create an ER model using an increasingly popular notation called Unified Modeling Language (UML). u There are tow additional notation that are often used to create ER models as following : –Chen Notation. –Crow’s Feet Notation. –( self learning ) Pearson Education © 2009
3 The Chen notation for ER modeling Pearson Education © 2009 NotationMeaning Strong entity Weak entity Relationship Relationship associated with a weak entity Entity name Relationship name Relationship name
4 The Chen notation for ER modeling Pearson Education © 2009 NotationMeaning Role name Recursive relationship with role names Attribute Entity name PK Simple name Multi valued Derived Attribute Relationship name Composite attribute Attribute
5 The Chen notation for ER modeling Pearson Education © 2009 NotationMeaning One to one (1:1) relationship One to many (1:M) relationship many to many (M:N) relationship Relationship name 11 Relationship name 1M Relationship name MN
6 The Chen notation for ER modeling Pearson Education © 2009 NotationMeaning Generalization/ specialization d: relationship is disjoint o: relationship is nondisjoint Double line : mandatory participation Single line : optional participation Super class Subclass d
Chapter # 4 BIS Database Systems
The transformation of an ER or EER model into a relational model
Conceptual / semantic modelling
Chapter 12 Enhanced Entity-Relationship Modeling Transparencies © Pearson Education Limited 1995, 2005.
Entity Relationship (ER) Modeling
4 1 Chapter 4 Entity Relationship (ER) Modeling Database Systems: Design, Implementation, and Management, Sixth Edition, Rob and Coronel.
Database Systems: Design, Implementation, and Management Eighth Edition Chapter 4 Entity Relationship (ER) Modeling.
1 Class Number – CS 304 Class Name - DBMS Instructor – Sanjay Madria Instructor – Sanjay Madria Lesson Title – EER Model –21th June.
Chapter 5 Understanding Entity Relationship Diagrams.
Chapter 4 Conceptual Modeling of Databases with Entity-Relationship Diagrams and the Unified Modeling Language.
Chapter 6 Methodology Logical Database Design for the Relational Model Transparencies © Pearson Education Limited 1995, 2005.
Copyright © 2004 Pearson Education, Inc.. Chapter 4 Enhanced Entity- Relationship and UML Modeling.
Copyright © 2011 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Chapter 7 Data Modeling Using the Entity- Relationship (ER) Model.
McGraw-Hill/Irwin Copyright © 2007 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 5 Understanding Entity Relationship Diagrams.
Methodology Logical Database Design for the Relational Model
1 Database Systems: A Practical Approach to Design, Implementation and Management International Computer Science S. Carolyn Begg, Thomas Connolly Lecture.
Enhanced ER modeling techniques Transparencies
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