Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9780357155868
Author: Carlos Coronel; Steven Morris
Publisher: Cengage Learning US
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Question
Chapter 2, Problem 1RQ
Program Plan Intro
Data Model:
- Data Model refers to the logical inter relationship and the data flow involved between different data elements.
- It defines how data is processed, connected and stored inside the system.
- A data model can be either concrete or abstract.
- It consists of components such as data types, data items, data sources, event sources, and links.
- The three styles of data model are conceptual data model, physical data model, and logical data model.
Expert Solution & Answer
Explanation of Solution
Importance of Data Models:
- The main function of a data model is that they help to understand complexity of real world environment.
- The data model is used by the
database designer to enhance the interaction among designers, application programmers, and end users. - Data models will help to represent the required data and the format that is used for different businesses processes.
- They help to prevent data redundancy.
- The database design tools have made the development of data models to possibly diminish the database design error potential.
- It also helps to eliminate the discrepancies between the database designs components and the real world data environment.
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Brad Kauffman is the senior director of projects for Rivera Engineering in Miami, Florida. The company performs engineering projects for public utilities and energy companies. Brad has started to create an Excel workbook to track estimated and actual hours and billing amounts for each project. He asks you to format the workbook to make the…
Chapter 2 Solutions
Database Systems: Design, Implementation, & Management
Ch. 2 - Prob. 1RQCh. 2 - What is a business rule, and what is its purpose...Ch. 2 - How do you translate business rules into data...Ch. 2 - Prob. 4RQCh. 2 - Explain how the entity relationship (ER) model...Ch. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQ
Ch. 2 - What is a relationship, and what three types of...Ch. 2 - Give an example of each of the three types of...Ch. 2 - What is a table, and what role does it play in the...Ch. 2 - Prob. 14RQCh. 2 - Prob. 15RQCh. 2 - Prob. 16RQCh. 2 - Prob. 17RQCh. 2 - Prob. 18RQCh. 2 - Prob. 19RQCh. 2 - Prob. 21RQCh. 2 - Prob. 22RQCh. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Using Figure P2.6 as your guide, work Problems 68....Ch. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Typically, a hospital patient receives medications...Ch. 2 - Prob. 10PCh. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Prob. 15PCh. 2 - Prob. 16PCh. 2 - Prob. 17P
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