Question 29 Which of the following is a benefit of using a model? Check all that apply. You can make changes quickly to a data design without incurring a large cost. Creating a model is less expensive than creating the real thing. A model is a concise way to communicate information. A model emphasizes selected, important aspects of the thing being modeled.

Question 29 Which of the following is a benefit of using a model? Check all that apply. You can make changes quickly to a data design without incurring a large cost. Creating a model is less expensive than creating the real thing. A model is a concise way to communicate information. A model emphasizes selected, important aspects of the thing being modeled.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

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Learning Objective PI3.2 Understand the process of entity-relationship modeling. STEP 1: Background It is very important that you understand the connections among entities, attributes, and relationships. This section has defined each of these terms for you. Typically, entities are described by their attributes, and they are related to other entities. For example, if "student name" is the entity, then age, gender, country of origin, marital status, and other demographic data are the attributes (characteristics) of that particular student. That student is also related to other entities such as financial information, major, and course information. STEP 2: Activity An entity-relationship model is one of the most challenging aspects of designing a database because you have to (1) understand the rules that govern how processes work and (2) be able to define and describe these rules in a picture. This section has provided you with the necessary tools to draw a basic ER model. Imagine the…