EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133544886
Author: AUER
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Expert Solution & Answer
Chapter 4, Problem 4.1RQ
Explanation of Solution
Developing
The database development process is a subdivision of system development cycle (SDLC). The purpose of developing database systems is to split the process into a series of steps which focus on the development of the software. These steps are grouped together to form a system development life cycle (SDLC).
Three stages of developing database systems:
The following three stages are used to develop database systems:
- Requirement analysis
- Component design
- Implementation
Requirement analysis:
- It is the process of finding user expectation for a new or modified product. The requirement is determined using the sources such as Sample forms, Reports, Queries, and Update activities.
- The requirement analysis can be divided into two types as follows:
- Functional requirement
- Non-Functional requirement
- Functional requirement:
- This requirement is based on the development of logical way. It contains input/output analysis, processing, and error handling.
- Non-Functional requirement:
- This requirement contains physical environment, interfaces, and user factors.
Component design:
- The purpose of component design is to
design the system for a data model. It contains tables, relationships, and constraints. It can be divided into three types as follows:Architectural design - Logical design
- Physical design.
- Architectural design:
- It is used to represent views, models, and structure of the system.
- Logical design:
- It is used to represent the data flow, input, and output of the system. Entity relationship diagram is an example for logical design which is used to determine the data flow of the system.
- Physical design:
- This design is based on the structure of front end and back end.
Implementation:
- It is a process of converting specification of system into an executable form. It is used to translate the design of the software into executable data which includes queries, forms, and reports.
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Go to the Webinars DeShawn wants to determine the number of webinars the company can hold on Tuesdays and Thursdays to make the highest weekly profit without interfering with consultations, which are also scheduled for Tuesdays and Thursdays and use the same resources. Use Solver to find this information as follows:
Use Total weekly profit as the objective cell in the Solver model, with the goal of determining the maximum value for that cell.
Use the number of Tuesday and Thursday sessions for the five programs as the changing variable cells.
Determine and enter the constraints based on the information provided in Table 3.
Use Simplex LP as the solving method to find a global optimal solution.
Save the Solver model below the Maximum weekly profit model label.
Solve the model, keeping the Solver solution.
Table 3: Solver Constraints
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Each webinar is scheduled at least once on Tuesday and once on Thursday
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Chapter 4 Solutions
EBK DATABASE CONCEPTS
Ch. 4 - Prob. 4.1RQCh. 4 - Prob. 4.2RQCh. 4 - Prob. 4.3RQCh. 4 - What is a use case, and what is its purpose?Ch. 4 - Give an example of a data constraint.Ch. 4 - Prob. 4.6RQCh. 4 - Define the term entity, and give an example other...Ch. 4 - Explain the difference between an entity class and...Ch. 4 - Define the term attribute, and give examples for...Ch. 4 - Define the term identifier, and indicate which...
Ch. 4 - Prob. 4.11RQCh. 4 - Prob. 4.12RQCh. 4 - Prob. 4.13RQCh. 4 - Prob. 4.14RQCh. 4 - List and give an example of the three types of...Ch. 4 - Prob. 4.16RQCh. 4 - Prob. 4.17RQCh. 4 - Prob. 4.18RQCh. 4 - Define the term weak entity, and give an example...Ch. 4 - Explain the ambiguity in the definition of the...Ch. 4 - Define the term associative entity, and give an...Ch. 4 - Define the terms supertype, subtype, and...Ch. 4 - What is an exclusive subtype relationship? Give an...Ch. 4 - What is an inclusive subtype relationship? Give an...Ch. 4 - Prob. 4.25RQCh. 4 - Prob. 4.26RQCh. 4 - Prob. 4.27RQCh. 4 - Prob. 4.28RQ
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