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Please identify what you think should be various candidate keys and write in your own words under what constraints (or conditions)

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  • Post Date 2018-11-08T09:20:12+00:00
  • Post Category New Samples

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Please identify what you think should be various candidate keys and write in your own words under what constraints (or conditions) each candidate key would be valid.

Relational Database

INSTRUCTIONS:

Question 1 

Consider the relation CLASS (Course#, Univ_Section#, InstructorName, Semester, BuildingCode, Room#, TimePeriod, Weekdays, CreditHours). This represents classes taught in a university with unique Univ_Section#. Please identify what you think should be various candidate keys and write in your own words under what constraints (or conditions) each candidate key would be valid.



Question 2 

Consider the following relations for a database that keeps track of student enrollment in courses and the books adopted for each course:

STUDENT (SSN, Name, Major, Bdate)

COURSE (Course#, Quarter, Grade)

ENROLL (SSN, Course#, Quarter, Grade)

BOOK_ADOPTION (Course#, Quarter, Book_ISBN)

TEXT (Book_ISBN, Book_Title, Publisher, Author)

Specify the foreign keys for this schema, stating any assumptions you make.

CONTENT:

Relational Database Name Course Instructor Date Based on the assumptions that the semester is a key candidate depicturing the period of study then it follows that this value varies and helps in building the relational database {Semester, BuildingCode, Room#, TimePeriod, Weekdays} this holds so long as the students cannot be assigned to different courses in the same lecture Room at the same time in the semester {Univ-Section#} holds so long as it is distinctive for all the semesters. {InstructorName, Semester

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