Homework Answers
Given:
- CLASS (Course#, Univ_Section#, Instructor_name, Semester, Building_code, Room#, Time_period, Weekdays, Credit_hours)
- Primary key - Univ_Section#
Candidate key is an attribute or set of attribute which is capable to enough to identify the tuples in the relation.
The possible candidate keys are
- Univ_Section# - Can indentify the tuples uniquely if Univ_Section# is different for all semesters.
- (Course#, Univ_Section#, Semester) - If Univ_Section# is not different for all semesters, then (Course#, Univ_Section#, Semester) could act as candidate key because collectively these attributes will be able to identify the tuples uniquely.
- (InstructorName, Semester) - Can indentify the tuples uniquely if only one course can be taught by the instructor in each semester.
- (Semester, BuildingCode, Room#, TimePeriod, Weekdays) - Can indentify the tuples uniquely if room number is different for different courses conducted in a particular semester.
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3. Consider the relation CLASS(Course#. Univ_Section#. Instructor_name. Semester Building_code. Room#. Time_period. Weekdays. Credit_hours). Thisrepresents classes taught...
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