Modern Database Management
13th Edition
ISBN: 9780134792293
Author: Hoffer
Publisher: PEARSON
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Chapter 4, Problem 4.26RQ
Explain three conditions that suggest a surrogate key should be created for the primary key of a relation.
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Describe three circumstances when a surrogate key for the primary key of a relation should be created.
What are three signs that a surrogate key should be generated for the primary key of a relation instead of using the main key?
List three conditions that suggest a surrogate key should be created for the primary key of a relation.
Chapter 4 Solutions
Modern Database Management
Ch. 4 - Define each of the following terms: determinant...Ch. 4 - Prob. 4.2RQCh. 4 - Prob. 4.3RQCh. 4 - Describe the primary differences between the...Ch. 4 - Summarize six important properties of relations.Ch. 4 - Describe two properties that each candidate key...Ch. 4 - Describe the three types of anomalies that can...Ch. 4 - Demonstrate each of the anomaly types with an...Ch. 4 - Fill in the blanks in each of the following...Ch. 4 - What is a well-structured relation? Why are...
Ch. 4 - Prob. 4.11RQCh. 4 - Describe how the following components of an E-R...Ch. 4 - Prob. 4.13RQCh. 4 - Prob. 4.14RQCh. 4 - Briefly describe four typical problems that often...Ch. 4 - Prob. 4.16RQCh. 4 - Explain how each of the following types of...Ch. 4 - Prob. 4.18RQCh. 4 - Prob. 4.19RQCh. 4 - Prob. 4.20RQCh. 4 - Prob. 4.21RQCh. 4 - What is the relationship between the primary key...Ch. 4 - Prob. 4.23RQCh. 4 - Explain what can be done with primary keys to...Ch. 4 - Prob. 4.25RQCh. 4 - Explain three conditions that suggest a surrogate...Ch. 4 - Prob. 4.27RQCh. 4 - For each of the following E-R diagrams from...Ch. 4 - Prob. 4.29PAECh. 4 - Prob. 4.30PAECh. 4 - For your answers to the following Problems and...Ch. 4 - Figure 4-3212 shows a class list for Millennium...Ch. 4 - Prob. 4.33PAECh. 4 - Prob. 4.34PAECh. 4 - Prob. 4.35PAECh. 4 - Prob. 4.36PAECh. 4 - Prob. 4.37PAECh. 4 - Prob. 4.38PAECh. 4 - Prob. 4.39PAECh. 4 - Transform Figure 2-15a, attribute version, to 3NF...Ch. 4 - The Public Safety office at Millennium College...Ch. 4 - Prob. 4.42PAECh. 4 - Prob. 4.43PAECh. 4 - Prob. 4.44PAECh. 4 - For your answers to Problem and Exercise 3-33 from...Ch. 4 - Prob. 4.46PAECh. 4 - Prob. 4.47PAECh. 4 - Figure 4-38 includes an EER diagram for a...Ch. 4 - Prob. 4.49PAECh. 4 - Prob. 4.50PAECh. 4 - Prob. 4.51PAECh. 4 - Prob. 4.52PAECh. 4 - Figure 4-40 shows an EER diagram for a university...Ch. 4 - Explore the data included in Table 4-9. Assume...Ch. 4 - Prob. 4.55PAECh. 4 - Prob. 4.56PAECh. 4 - Prob. 4.57PAECh. 4 - Prob. 4.58PAE
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- Explain three conditions that suggest a surrogate key should be created for the primary key of a relation.arrow_forwardunder what three circumstances does it become necessary to generate a surrogate key in place of the main key of a relation?arrow_forwardDescribe three situations in which a substitute key for the main key of a relation should be produced.arrow_forward
- What are three signals that a surrogate key should be generated for the primary key of a relation instead of using the main key?arrow_forwardDescribe three circumstances in which a substitute key for a relation's primary key should be established.arrow_forwardHow does the primary key of a relation relate to the interdependencies of its characteristics from a functional standpoint?arrow_forward
- What is the connection between the primary key of a relation and the functional relationships that exist between all of its attributes?arrow_forwardWhat are three advantages of using a surrogate key rather than the main key to access a relation instead?arrow_forwardExplain three cases when a surrogate key should be generated in place of the main key of a relation.arrow_forward
- Three instances in which a surrogate key should be constructed for the relation's primary keyarrow_forwardxexplanation of three situations when a surrogate key should be produced for the primary key of a relation?arrow_forwardDescribe three scenarios when a surrogate key should replace a relation's primary key.arrow_forward
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