Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 8.49PAE
When a student has not chosen a major at a university, the university often enters a value of “Undecided” for the major field. Is “Undecided” a way to represent the null value? Should it be used as a default value? Justify your answer carefully.
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When a student does not declare a major at an institution, the major field is often filled with the value "Undecided." Is the null value represented by "Undecided"? Is it appropriate to set that as the default? Make a strong case for your answer.
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What is the difference between single-valued attribute and multi-valued at attribute and how are these one-of-a-kind from composite attribute and easy attribute?
Chapter 8 Solutions
Modern Database Management
Ch. 8 - Prob. 8.1RQCh. 8 - Prob. 8.2RQCh. 8 - Prob. 8.3RQCh. 8 - Prob. 8.4RQCh. 8 - Prob. 8.5RQCh. 8 - Prob. 8.6RQCh. 8 - Prob. 8.7RQCh. 8 - Prob. 8.8RQCh. 8 - Explain why you sometimes have to reserve much...Ch. 8 - Why are field values sometimes coded?
Ch. 8 - Prob. 8.11RQCh. 8 - Prob. 8.12RQCh. 8 - Explain why normalized relations may not comprise...Ch. 8 - Prob. 8.14RQCh. 8 - List three common situations that suggest that...Ch. 8 - Explain the reasons why some experts are against...Ch. 8 - Prob. 8.17RQCh. 8 - Prob. 8.18RQCh. 8 - Prob. 8.19RQCh. 8 - Prob. 8.20RQCh. 8 - Prob. 8.21RQCh. 8 - Prob. 8.22RQCh. 8 - One of the strongest recommendations regarding...Ch. 8 - Explain why an index is useful only if there is...Ch. 8 - Indexing can clearly be very beneficial. Why...Ch. 8 - Prob. 8.26RQCh. 8 - Prob. 8.27RQCh. 8 - Describe the role of data dictionary in the...Ch. 8 - Prob. 8.29RQCh. 8 - Prob. 8.30RQCh. 8 - Explain how creating a view may increase data...Ch. 8 - Prob. 8.32RQCh. 8 - Prob. 8.33RQCh. 8 - Prob. 8.34RQCh. 8 - Prob. 8.35RQCh. 8 - Prob. 8.36RQCh. 8 - Prob. 8.37RQCh. 8 - Prob. 8.38RQCh. 8 - Prob. 8.39RQCh. 8 - How can views be used as part of data security?...Ch. 8 - Prob. 8.41RQCh. 8 - Prob. 8.42RQCh. 8 - Consider the following two relations for...Ch. 8 - Prob. 8.44PAECh. 8 - Prob. 8.45PAECh. 8 - Prob. 8.46PAECh. 8 - Prob. 8.47PAECh. 8 - Suppose you are designing a default value for the...Ch. 8 - When a student has not chosen a major at a...Ch. 8 - Prob. 8.50PAECh. 8 - Prob. 8.51PAECh. 8 - Consider the relations in Problem and Exercise...Ch. 8 - Prob. 8.53PAECh. 8 - Prob. 8.54PAECh. 8 - Prob. 8.55PAECh. 8 - Prob. 8.56PAECh. 8 - Prob. 8.57PAECh. 8 - Consider the relations specified in Problem and...Ch. 8 - Prob. 8.59PAECh. 8 - Prob. 8.60PAECh. 8 - Prob. 8.61PAECh. 8 - Prob. 8.62PAECh. 8 - Prob. 8.63PAECh. 8 - Prob. 8.64PAECh. 8 - Problems and Exercises 8-65 through 8-68 refer to...Ch. 8 - Prob. 8.66PAECh. 8 - Problems and Exercises 8-65i5 through 8-68 refer...Ch. 8 - Refer to Figure 4-5 0. For each of the following...Ch. 8 - Prob. 8.69PAECh. 8 - Prob. 8.70PAECh. 8 - Prob. 8.71PAECh. 8 - Prob. 8.72PAECh. 8 - Prob. 8.73PAECh. 8 - Prob. 8.74PAECh. 8 - Prob. 8.75PAECh. 8 - Prob. 8.76PAECh. 8 - Prob. 8.77PAE
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- Consider an automobile dealership with three locations. Data fields exist for stock number, vehicle identification number, make, model, year, color, and invoice cost. Identify the possible candidate keys, the likely primary key, a probable foreign key, and potential secondary keys. What is the best keys possible?arrow_forwardDetermine possible values to be considered for the age field in a student record at a university, Variation of default in the age field for school within university or degree sought as per student characteristic and some fundamental problem with this field.arrow_forwardWhat is the difference between single-valued attribute and multi-valued at attribute and how are these different from composite attribute and simple attribute.arrow_forward
- Explain why an index is only useful if there is sufficient variation in the values of an attribute.arrow_forwardQ20 Which of the following is closest to a unique identifier in the Entity-Relationship Data model? Group of answer choices composite key surrogate key primary key foreign keyarrow_forwardS.N. Question Write your Answer 1 Simple Attributes (any 2) 2 Composite Attribute 5 Derived attribute 6 Relationship is (1-to-1/ 1-to-many/many-to-many) 7 Participation of COUNTRY is (Optional/Mandatory) 8 Participation of STAFF is (Optional/Mandatory) Just answer without explanationarrow_forward
- Assume that an attribute comprising a primary key is also a candidate key. What would be your response?arrow_forwardS.N. Question Write your Answer 1 Simple Attributes (any 2) 2 Composite Attribute 3 Multivalued Attribute 4 Key Attributes (any 2) 5 Derived attribute 6 Relationship is (1-to-1/ 1-to-many/many-to-many) 7 Participation of COUNTRY is (Optional/Mandatory)arrow_forwardPlease answer below questions based on this dimensional model and additional information provided Q1: What is the maximum possible fact data volume in terms of record/row count? Answer: Q3: The m:n ratio from attribute B3 to attribute B4 is changed from 1:3 to 1:1 due to some organizational changes. By how many times the maximum possible fact data volume (by record count) decreases? Answer: Q4: If there is an aggregate fact table at quarter dimension level with other attributes B4, C5 and A3. What is the maximum possible record count of this aggregate table as per the current state mentioned above? Answer:arrow_forward
- Q3: What is the distinction between Attribute Value Skew and Partition Skew? Give an example of your response.arrow_forwardTwo attributes (columns) that have the same range of values representing the same thing demonstrate which of the following properties? Group of answer choices the same values of identity the same domain of values the same surrogate values the same determinant valuesarrow_forwardGive an example of why an index wouldn't be useful if the values of the attribute didn't cover a wide enough range. Only in this case would you want to use an index.arrow_forward
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