Modern Database Management (12th Edition)
12th Edition
ISBN: 9780133544619
Author: Jeffrey A. Hoffer, Ramesh Venkataraman, Heikki Topi
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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Please transform the following Entity-Relationship Schema (Diagram) into a Relational
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the engineer responsible for the project. WORKS_ON: the project an engineer works on).
MANAGES
SSNO
FName
PNo
PROJECT
EMPLOYEE
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PName
|1
Address
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WORKS
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ENGINEER
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RESP
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What is the reason that normalized relations may not compromise an efficient physical implementation structure?
Briefly describe four problems that may arise when merging relations
Chapter 4 Solutions
Modern Database Management (12th Edition)
Ch. 4 - Prob. 4.1RQCh. 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 - For your answers to the following Problems and...Ch. 4 - Transform Figure 2-15a, attribute version, to 3NF...Ch. 4 - Prob. 4.41PAECh. 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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- Justify 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_forwardExplain three scenarios in which a surrogate key for a relation's primary key should be generated.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
- Computer Science: Why normalized relations may not compromise an efficient physical implementation structure.arrow_forwardDefine three conditions under which it is appropriate to use a surrogate key in place of the primary key of a relation.arrow_forwardA 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_forward
- What 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_forwardExplain three conditions that suggest a surrogate key should be created for the primary key of a relation.arrow_forward2. a. What characteristics do tables that conform to the concept of well-informed relations have? b. Describe a dependency diagram and explain its purpose c. Normalize the relation given below Order Orde PartN | Part Unit PartQ | Supplie Suppli Suplli Suppl Suppli Supplier rDat umbe Nam Pric uantit rNumb erNam erStre Num ierCit erSateZip e e e er etarrow_forward
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