Database Concepts (8th Edition)
8th Edition
ISBN: 9780134601533
Author: David M. Kroenke, David J. Auer, Scott L. Vandenberg, Robert C. Yoder
Publisher: PEARSON
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Chapter 4, Problem 4.11RQ
Explanation of Solution
Identifier:
Identifier is an attribute which is used to uniquely identify a particular entity instances from an entity.
Note: An entity instance is an occurrence of a particular entity.
Composite identifier:
Composite identifier is combinations of two or more attributes in an entity that can be uniquely identify each instance in the entity...
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Chapter 4 Solutions
Database Concepts (8th Edition)
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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- As a comparison tool, you may use a histogram that has been normalised. Is it OK to just have a normalised histogram and not also have one that is not normalised?arrow_forwardWhat name diagram is? Correct answer needed.arrow_forwardWhat exactly does it mean when someone uses the term "Identifier attribute"?arrow_forward
- Let's imagine you want to train and evaluate a classifier with just a little quantity of data. To evaluate the classifier, what method would you use? Why?arrow_forwardIn order to declare a variable, "type" alone is not sufficient. To phrase this another way, each variable has both a data type as well as some other form of attribute. This idea enables us to represent the characteristics of any variable; but, how can we put it to use?arrow_forwardFor simplicity, subtype discriminators were left off many figures in this chapter. Add subtype discriminator notation in each figure listed below. If necessary, create a new attribute for the discriminator.arrow_forward
- Your department is interested in keeping track of information aboutmajors. Design a data structure that will maintain useful information for yourdepartment. The roster of majors, of course, should be ordered by last name(and then by first, if there are multiple students with the same last name).Your department is interested in keeping track of information aboutmajors. Design a data structure that will maintain useful information for yourdepartment. The roster of majors, of course, should be ordered by last name(and then by first, if there are multiple students with the same last name).Your department is interested in keeping track of information aboutmajors. Design a data structure that will maintain useful information for yourdepartment. The roster of majors, of course, should be ordered by last name(and then by first, if there are multiple students with the same last name).arrow_forwardLet's say you wish to train and assess a classifier using just a little amount of data. Which approach would you use to assess the classifier? Why?arrow_forwardCreate an ER diagram that correctly describes the database for exams at Campus in Bäcksvängen in accordance with the following description: (Own assumptions must be clearly described.) Staff for various functions are involved in the exams. All staff have a full name and a unique staff code. Some people are examiners on one or more courses. A course has one name and one unique ladok code. For a course, you can add up its points based on the associated elements. One part is part of a course (for example an exam, a laboratory or project). A course can have several different parts. An element has a name, a description, a torque code, one point and two or more grades (eg: U, G, VG). An element can only belong to one course. Since the database is to process the exams, it is obvious that a part like described as an examination has an examination opportunity that is identified, among other things, by the date, start time, end time and that it is possible to calculate total writing time. A…arrow_forward
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