Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 2, Problem 2.39E
Program Plan Intro
Candidate Key:
Candidate Key is the set of minimal attribute which can identify the whole set of attributes present in the tuple. It is a set of primary keys and is unique.
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Table 1 is the Sales table, which is an unnormalized table. The description of the Sales table are SNUM = salesman number, CNUM = customer number, WNUM = warehouse number, SAMOUNT = sale amount, etc.
a.)Write down four functional dependencies (FDs) that are valid in the Sales table
b.)Write down the Sales table's normalization result that is in the 2NF, but not in the 3NF.Explain why the table is not in the 3NF.
Normalize the following given data to 1/2/3 NF. State the relations schema after everynormalization.
Decompose the above relation using the Boyce-code normal form decomposition. What is the key relation for the relation R
Chapter 2 Solutions
Database Concepts (7th Edition)
Ch. 2 - Prob. 2.1RQCh. 2 - Define the term entity, and give an example of an...Ch. 2 - Prob. 2.3RQCh. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - Prob. 2.7RQCh. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - Define the term unique key and give an example.
Ch. 2 - Prob. 2.11RQCh. 2 - Prob. 2.12RQCh. 2 - Prob. 2.13RQCh. 2 - Describe four uses of a primary key.Ch. 2 - Prob. 2.15RQCh. 2 - Prob. 2.16RQCh. 2 - Prob. 2.17RQCh. 2 - Explain the term foreign key, and give an example.Ch. 2 - Prob. 2.19RQCh. 2 - Prob. 2.20RQCh. 2 - Explain three possible interpretations of a null...Ch. 2 - Give an example of a null value (other than one...Ch. 2 - Prob. 2.23RQCh. 2 - Prob. 2.24RQCh. 2 - Prob. 2.25RQCh. 2 - Prob. 2.26RQCh. 2 - Prob. 2.27RQCh. 2 - Define the term primary key in terms of functional...Ch. 2 - Prob. 2.31RQCh. 2 - Examine the data in the Veterinary Office...Ch. 2 - Prob. 2.33RQCh. 2 - Describe a modification problem that occurs when...Ch. 2 - Prob. 2.35RQCh. 2 - Prob. 2.36RQCh. 2 - Prob. 2.37RQCh. 2 - Apply the normalization process to the Veterinary...Ch. 2 - Prob. 2.39ECh. 2 - Prob. 2.40E
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- Develop recurrence relations for the last 3 columns of table 1. Use the recurrence relation you developed to complete the table for these months: • Month 59 • Month 60 • Month 61 • Month119 • Month 120 • Month 121 Show your calculations and completed table.arrow_forwardconvert it to relations that are normalizationarrow_forwardGiven the relations a(name, address, title) and b(name, address, salary), show how to express a natural full outer join b using the full outer-join operation with an on condition rather than using the natural join syntax. This can be done using the coalesce operation. Make sure that the result relation does not contain two copies of the attributes name and address and that the solution is correct even if some tuples in a and b have null values for attributes name or address.arrow_forward
- Convert the table above to a relation in first normal form. Illustrate the relation with the sample data in the table.arrow_forwardDevelop a set of relations in third normal form. Include a new column with the heading Violation in the appropriate table to explain the reason for each ticket. Values in this column are: expired parking meter (ticket code 1), no parking permit (ticket code 2), and handicap violation (ticket code 3).arrow_forwardExplain the concept of functional dependencies in the context of normalization.arrow_forward
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- Write at least 3 functional dependency from the tablearrow_forwardReview FamCation relations and determine if they are all in 3NF. If not, which relations do you need to normalize and how?arrow_forwardConsider the following relations. The primary keys are underlined. All attributes are of type string if not indicated otherwise. [Hint: Use multi-step and multi-line queries to ease the formulation of queries. Use the rename operator ρ to give intermediate query results a name (some textbooks use the equivalent ‘←’ notation). Aggregate functions as you can find them defined in some textbooks are not allowed, neither in homework assignments nor in exams.] Student(sID , name, degree: integer, dID) Department(dID , name, address) Lecture(lID , name, degree: integer, pID, dID) Professor(pID , name, dID) Register(rID , sID, lID, Semester, score: integer) Relational Algebra Queries: 1. Find the names of students who have registered every lecture of CISE department. 2. Find the students who got the highest score in the lecture ‘DB’ in 2021 Fall semester. Show names and scores together. 3. Find the names of students in CISE department who never received a score less than 80. 4. Find the…arrow_forward
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