DataModeling.ppt - Data Modeling Yong Choi School of...

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Data Modeling Yong Choi School of Business CSUB
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Part # 2 2 Study Objectives Understand concepts of data modeling and its purpose Learn how relationships between entities are defined and refined, and how such relationships are incorporated into the database design process Learn how ERD components affect database design and implementation Learn how to interpret the modeling symbols
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Part # 2 3 Why Data Modeling? Data Model by CASE tool = Actual Database Represent “reality” of the actual database Blue print: documentation Effective Communication Tool User involvement Identify the business rules to be stored in the database Independence from a particular DBMS Example of data model by CASE tool on the website
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Part # 2 4 Conceptual data modeling Conceptual data modeling The conceptual data modeling revolves around discovering and analyzing organizational and users data requirements. What data is important What data should be maintained The major activity of this phase is identifying entities , attributes , and their relationships to construct model using the Entity Relationship Diagram methodology .
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Part # 2 5 Entity Relationship diagram (ERD) Entity Relationship diagram (ERD) Data modeling methodology Developed by Peter Chen (1976). See his original ERD article on the class website ERD is commonly used to: Translate different views of data among managers, users, and programmers to fit into a common framework.
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