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Chapter 3 - 1-29 - CGS 2545 Database Concepts Spring 2010...

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CGS 2545: Database Concepts (Chapter 3) Page 1 © Mark Llewellyn CGS 2545: Database Concepts Spring 2010 Chapter 3 – Modeling Data In The Organization School of Electrical Engineering and Computer Science University of Central Florida Instructor : Dr. Mark Llewellyn [email protected] HEC 236, 407-823-2790 http://www.cs.ucf.edu/courses/cgs2545/spr2010
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CGS 2545: Database Concepts (Chapter 3) Page 2 © Mark Llewellyn Chapter 3 Objectives Realize the importance of data modeling. Understand the reasoning behind needing good names and definitions for entities, relationships, and attributes. Distinguish unary, binary, and ternary relationships. Model different types of attributes, entities, relationships, and cardinalities. Draw E-R diagrams for common business situations. Convert many-to-many relationships to associative entities. Model time-dependent data using time stamps.
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CGS 2545: Database Concepts (Chapter 3) Page 3 © Mark Llewellyn SDLC Revisited – Data Modeling is an Analysis Activity Purpose – thorough analysis Deliverable – functional system specifications Database activity – conceptual data modeling Project Identification and Selection Project Initiation and Planning Analysis Physical Design Implementation Maintenance Logical Design Analysis Project Initiation and Planning
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CGS 2545: Database Concepts (Chapter 3) Page 4 © Mark Llewellyn Business Rules Statements that define or constrain some aspect of the business. Assert business structure. Control/influence business behavior. Examples: A student may register for a course only if they have satisfied the prerequisites for the course. A customer qualifies for a 10% discount if their purchase totals more than $250.00. Expressed in terms familiar to end users. Automated through DBMS software.
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CGS 2545: Database Concepts (Chapter 3) Page 5 © Mark Llewellyn Business Rules Most organizations have many business rules. Capturing and documenting business rules is an important and complex task. Business rules have been used in information systems for some time now, however, in the database world they have been more commonly referred to as integrity constraints . In general, an integrity constraint has a more limited scope than does a business rule. An integrity constraint is typically more focused on maintaining valid data values and relationships. A business rule has a much broader scope that includes any rule which has an impact on the databases of an organization. Business rules are commonly referred to as the “ standards and procedures ” of an organization.
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CGS 2545: Database Concepts (Chapter 3) Page 6 © Mark Llewellyn Business Rules Business rules are a core concept in an enterprise because they express the policies of the organization and guide both individual as well as aggregate behavior.
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