Functional dependencies: Functional dependency is a term in the relational database theory which refers to a constraint that is located in between the two sets of attributes in a relation from a database. The functional dependencies of the given database are as follows. 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.

BuyFind

A Guide to SQL

9th Edition
Philip J. Pratt
Publisher: Course Technology Ptr
ISBN: 9781111527273
BuyFind

A Guide to SQL

9th Edition
Philip J. Pratt
Publisher: Course Technology Ptr
ISBN: 9781111527273

Solutions

Chapter 2, Problem 17RQ
Program Plan Intro

Functional dependencies:

Functional dependency is a term in the relational database theory which refers to a constraint that is located in between the two sets of attributes in a relation from a database. The functional dependencies of the given database are as follows.

  • 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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