Tancuyuschie devushki na rabochij stol programma 1. PERANCANGAN SISTEM INFORMASI Session Session 55 Data Data Modeling Modeling nd Based Based on on System System Analysis Analysis && Design Design 22nd Edition Edition Authors Authors:: Alan Alan Dennis Dennis && Barbara Barbara Haley Haley Wixom Wixom Publisher Publisher:: John John Wiley Wiley && Sons Sons PowerPoint Course Material for SCELE Graduate Program Information Technology Faculty of Computer Science – UNIVERSITY OF INDONESIA Objectives Objectives Understand the rules and style guidelines for creating entity relationship diagrams. Be able to create an entity relationship diagram.
Become familiar with the data dictionary and metadata. Become familiar with the process of normalization. Understand how to balance between entity relationship diagrams.
2 PowerPoint Course Material for SCELE Graduate Program Information Technology Faculty of Computer Science – University of Indonesia Key Key Definitions Definitions Data model A formal way of representing the data that are used and created by a business system Shows the people, places and things about which data is captured and the relationships among them. Logical data model shows the organization of data without indicating how it is stored, created, or manipulated 3 PowerPoint Course Material for SCELE Graduate Program Information Technology Faculty of Computer Science – University of Indonesia Key Key Definition Definition Physical data model shows how the data will actually be stored in databases or files. Normalization is the process analysts use to validate data models. Data models should balance with process models 4 PowerPoint Course Material for SCELE Graduate Program Information Technology Faculty of Computer Science – University of Indonesia THE ENTITY-RELATIONSHIP DIAGRAM (ERD) 5 PowerPoint Course Material for SCELE Graduate Program Information Technology Faculty of Computer Science – University of Indonesia What What Is Is an an ERD?
A picture showing the information created, stored, and used by a business system. Entities generally represent similar kinds of information Lines drawn between entities show relationships among the data High level business rules are also shown 6 PowerPoint Course Material for SCELE Graduate Program Information Technology Faculty of Computer Science – University of Indonesia Using Using the the ERD ERD to to Show Show Business Business Rules Rules Business rules are constraints that are followed when the system is in operation.
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