Modern Database Management
13th Edition
ISBN: 9780134792293
Author: Hoffer
Publisher: PEARSON
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Chapter 4, Problem 4.15RQ
Briefly describe four typical problems that often arise in merging relations and common techniques for addressing those problems.
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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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- Summarize six important properties of relationsarrow_forwardJustify how the main key of a relation is connected to all of the qualities of the relationship in issue, as well as the functional dependencies that exist among all of those features.arrow_forward13 of 40 Consider the following E/R diagram with isa relationships, noting that attribute a is the key of R. If we use an E/R-style approach and convert this diagram into relations, which of the following relations will be among the result? R d Select one: O ST(a,b,c,d) O s(a,c) O T(a,b,d) O R(a,c,d)arrow_forward
- A subtype/supertype relationships are especially important in Enhanced Entity Relationship Modeling. Explain using an example how you would covert subtype/supertype relationships to relations in database design.arrow_forwardWhat are the pros and cons that you can see of representing relations as a graph or a matrix? What is one way that you might use either a graph or a matrix to represent a relation in computer science?arrow_forwardDefine three conditions under which it is appropriate to use a surrogate key in place of the primary key of a relation.arrow_forward
- Consider the following E/R diagram with isa relationships, noting that attribute b is the key of R. If we use an E/R-style approach and convert this diagram into relations, which of the following relations will be among the result? Select one: Y(a,c,d) T(a,b,d) Z(b,c) S X(a,b,c,d) R barrow_forwardThree examples of when it might be appropriate to generate a surrogate key in place of the main key of a relation.arrow_forwardWhen working with database entity relationship modeling, should the cardinality between entities be translated/ read from both ends of the notation? In other words, should a relationship between entities have the ability to understood if read forwards and backwards?arrow_forward
- Describe the differences in meaning between the terms relation and relation schema.arrow_forwardThe Entity Relationship (ER) Model is intended as a description of real-world entities. The ER Diagram represents the conceptual level of database design meanwhile the relational schema is the logical level for the database design. Refer to the Figure 1 below and convert the given ER Diagram into a relational schema. Identify all the primary as well as foreign key relations that should be implemented in the required relational schema.arrow_forward120. Which formal method that locates and analyses relation schemas on the basis of their primary, candidate keys, and the FD’s that are present among the attributes of these schemas: a. Functional dependency b. Database modeling c. Normalization d. Decompositionarrow_forward
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