Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 4.9RQ
Fill in the blanks in each of the following statements:
- A relation that has no partial functional dependencies is innormal form.
- A relation that has no transitive dependencies is innormal form.
- A relation that has no multivalued attributes is in normal form.
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You are given a relation R with the following attributes R(A,B,C,D,E).
Assume that you were given the following functional dependencies:
• FD1= AB -> E
• FD2: = D -> C
(a) What is a valid key for this relation? justify your response.
(b) Is this relation in 3NF (Third Normal Form)? Justify your response. If it is not in 3NF, normalize the relation and demonstrate all steps of normalization.
We have a relation with the following attributes: R={A,B,C,D,E} and all the attributes are atomic.
Primary key of this relation is AB. What is the normal form of this relation given the following functional dependencies:
AC→D, AB→C, AB→D, AB→E
Select one:
a. First Normal Form
b. This relation is not normal.
c. Third Normal Form
d. Second Normal Form
just answer true/false a]Disjointness means that every entity of a supertype must be an entity in one of the subtypes in the generalization hierarchy.
b]Record is a set of more fields that describe a person, place or thing.
c]Cardinality is the number of tuples in a relation.
d]Referential integrity must have null values only.
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- What is the connection between a relation's primary key and the functional relationships between all of its attributes?arrow_forwardFor each of the following pairs of expressions, give instances of relations thatshow the expressions are not equivalent. σθ(E1 ⟕E2) and E1 ⟕σθ(E2), where θ uses only attributes from E2.arrow_forwardExplain the connection between a relation's primary key and the functional dependencies that exist between all of the characteristics in the relationship in question.arrow_forward
- Draw the relationships and entities model for each of the following: * in the traditional way* for example: see the pic??. In the database of the library, the author can author more than one book, and the book can be subscribed toWritten by more than one authorarrow_forwardBriefly discuss the properties of a relation.arrow_forwardWhy do the functional dependencies among a relation's attributes have to do with the primary key of the relation in the first place?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 precisely do you mean when you say that a dependence is transitive?arrow_forwardWhat is the link between the main key of a relation and the functional connections between all of its attributes?arrow_forward
- A transitive dependency is equivalent to which of the following?A) A functional dependency between two or more key attributes.B) A functional dependency between two or more nonkey attributes.C) A relation that is in first normal form.D) A relation that is in second normal form.arrow_forwardThe model above needs some improvement. Where you can apply all the normalization rules to attributes. Furthermore, you also need to explain entities and relations between them, and the purpose of attributes by showing why and how they exist ?.arrow_forwardWhat does it mean to be a weak entity? Give an illustration.arrow_forward
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