The document provides an overview of entity-relationship (ER) modeling concepts including entities, attributes, relationships, and ER diagram notation. It then presents an example database application for a company (COMPANY) and defines the entity types, relationship types, and attributes that would be included in an ER diagram for the COMPANY database schema. Key concepts covered include entities, attributes, relationships, cardinalities, participation constraints, and weak entity types.

2. Chapter 3 Data Modeling Using the Entity-Relationship (ER) Model Copyright © 2004 Pearson Education, Inc.

10. ENTITY SET corresponding to the ENTITY TYPE CAR car 1 ((ABC 123, TEXAS), TK629, Ford Mustang, convertible, 1999, {red, black}) car 2 ((ABC 123, NEW YORK), WP9872, Nissan 300ZX, 2-door, 2002, {blue}) car 3 ((VSY 720, TEXAS), TD729, Buick LeSabre, 4-door, 2003, {white, blue}) . . . CAR Registration(RegistrationNumber, State), VehicleID, Make, Model, Year, {Color}

12. ER DIAGRAM – Entity Types are: EMPLOYEE, DEPARTMENT, PROJECT, DEPENDENT

14. Example relationship instances of the WORKS_FOR relationship between EMPLOYEE and DEPARTMENT e 1  e 2  e 3  e 4  e 5  e 6  e 7  EMPLOYEE r 1 r 2 r 3 r 4 r 5 r 6 r 7 WORKS_FOR  d 1  d 2  d 3 DEPARTMENT

15. Example relationship instances of the WORKS_ON relationship between EMPLOYEE and PROJECT e 1  e 2  e 3  e 4  e 5  e 6  e 7  r 1 r 2 r 3 r 4 r 5 r 6 r 7  p 1  p 2  p 3 r 8 r 9

17. ER DIAGRAM – Relationship Types are: WORKS_FOR, MANAGES, WORKS_ON, CONTROLS, SUPERVISION, DEPENDENTS_OF

19. Weak Entity Type is: DEPENDENT Identifying Relationship is: DEPENDENTS_OF

21. Many-to-one (N:1) RELATIONSHIP e 1  e 2  e 3  e 4  e 5  e 6  e 7  EMPLOYEE r 1 r 2 r 3 r 4 r 5 r 6 r 7 WORKS_FOR  d 1  d 2  d 3 DEPARTMENT

22. Many-to-many (M:N) RELATIONSHIP e 1  e 2  e 3  e 4  e 5  e 6  e 7  r 1 r 2 r 3 r 4 r 5 r 6 r 7  p 1  p 2  p 3 r 8 r 9

24. A RECURSIVE RELATIONSHIP SUPERVISION e 1  e 2  e 3  e 4  e 5  e 6  e 7  EMPLOYEE r 1 r 2 r 3 r 4 r 5 r 6 SUPERVISION 2 1 1 2 2 1 1 1 2 1 2 2 © The Benjamin/Cummings Publishing Company, Inc. 1994, Elmasri/Navathe, Fundamentals of Database Systems, Second Edition

25. Recursive Relationship Type is: SUPERVISION (participation role names are shown)

27. Attribute of a Relationship Type is: Hours of WORKS_ON

30. The (min,max) notation relationship constraints Employee Department Manages (1,1) (0,1) Employee Department Works-for (1,N) (1,1)

31. COMPANY ER Schema Diagram using (min, max) notation

35. Some of the Currently Available Automated Database Design Tools Data modeling, design and reengineering Visual Basic and Visual C++ Visio Enterprise Visio Data modeling, business logic modeling Enterprise Application Suite Sybase Conceptual modeling up to code maintenance Xcase Resolution Ltd. Mapping from O-O to relational model RW Metro Rogue Ware Modeling in UML and application generation in C++ and JAVA Rational Rose Rational Mapping from O-O to relational model Pwertier Persistence Inc. Data, process, and business component modeling Platinum Enterprice Modeling Suite: Erwin, BPWin, Paradigm Plus Platinum Technology Data modeling, object modeling, process modeling, structured analysis/design System Architect 2001 Popkin Software Database modeling, application development Developer 2000 and Designer 2000 Oracle Database administration and space and security management DB Artisan Database Modeling in ER and IDEF1X ER Studio Embarcadero Technologies FUNCTIONALITY TOOL COMPANY

36. ER DIAGRAM FOR A BANK DATABASE © The Benjamin/Cummings Publishing Company, Inc. 1994, Elmasri/Navathe, Fundamentals of Database Systems, Second Edition