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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Conceptual data models are a kind of data model used in computer systems, and its primary emphasis is on ideas.
The definition of a variable must contain not just the variable's name, but also its "type" and "additional attributes." That is to say, all variables have characteristics beyond just their data type. Explain in further detail the idea that will eventually let us describe any variable with greater precision.
Creating models in all three dimensions
A variable cannot be sufficiently described by the word "type." Or to put it another way, every variable has some kind of attributes and data types. What is the best approach to describe any variable's characteristics using the notion that makes this possible?
To declare a variable, 'type' isn't adequate. To put it another way, all variables have data types and other attributes. How can we use the concept that enables us to represent any variable's characteristics?
Entity modeling is a top-down approach * that involves entities relationships tables foreign key classes هذا السؤال مطلوب
If all that is known about a variable is its "type," then the information that may be gathered may be insufficient. Each variable is comprised of a number of attributes as well as different sorts of data. Please provide an example of this idea being put into practise to explain how it might be utilised to describe a particular variable.
For what reasons would one call a model prescriptive?
Explain the concept of reactive programming in the context of data binding and provide examples of how it can be used to build responsive and efficient user interfaces.
Explain change models in a succinct manner.
The term "idea data model" refers to a kind of data model used in computer systems that is centered on concepts.