A Guide to SQL
9th Edition
ISBN: 9781337668880
Author: Pratt
Publisher: Cengage
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Chapter 2, Problem 16RQ
Program Plan Intro
Functional dependencies:
Functional dependency is a term in the relational
- DEPARTMENT_NUM à DEPARTMENT_NAME
- ADVISOR_NUM à ADVISOR_LAST_NAME, ADVISOR_FIRST_NAME, DEPARTMENT_NUM
- COURSE_CODE à DESCRIPTION
- STUDENT_NUM à STUDENT_LAST_NAME, STUDENT_FIRST_NAME, ADVISOR_NUM
- STUDENT_NUM, COURSE_CODE à GRADE
Relations:
The term relation refers to the relationship between the data represented in a row-column format. The relative relations for the given database table is as follows:
- DEPARTMENT (DEPARTMENT_NUM, DEPARTMENT_NAME)
- ADVISOR (ADVISOR_NUM, ADVISOR_LAST_NAME, ADVISOR_FIRST_NAME, DEPARTMENT_NUM)
- COURSE (COURSE_CODE, DESCRIPTION)
- STUDENT (STUDENT_NUM, STUDENT_LAST_NAME, STUDENT_FIRST_NAME, ADVISOR_NUM)
For the database, a new relation is defined as it is mentioned that an advisor can advise any number of students but each student has only one advisor. Therefore, it can be defined as follows:
STUDENT_COURSE (STUDENT_NUM, COURSE_CODE, GRADE)
The above relations are defined for the condition when an advisor can advise any number of students but the student can have only one advisor. Therefore, it clearly represents that the relation between the advisor and the student is many-to-one relation.
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Chapter 2 Solutions
A Guide to SQL
Ch. 2 - Prob. 1RQCh. 2 - What is an attribute?Ch. 2 - What is a relationship? What is a one-to-many...Ch. 2 - Prob. 4RQCh. 2 - What is a relation?Ch. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - How do you qualify the name of a field, and when...Ch. 2 - Prob. 9RQCh. 2 - What is a primary key? What is the primary key for...
Ch. 2 - Prob. 11RQCh. 2 - Prob. 12RQCh. 2 - Define second normal form. What types of problems...Ch. 2 - Define third normal form. What types of problems...Ch. 2 - Prob. 15RQCh. 2 - Prob. 16RQCh. 2 - List the changes you would need to make to your...Ch. 2 - Prob. 1TDCh. 2 - Prob. 2TDCh. 2 - Prob. 3TDCh. 2 - Prob. 4TDCh. 2 - Prob. 5TDCh. 2 - Prob. 1CATCh. 2 - Identify the functional dependencies in the...Ch. 2 - Prob. 3CATCh. 2 - Determine the functional dependencies that exist...Ch. 2 - Prob. 2SCGCh. 2 - Prob. 3SCG
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