Computer Science · Database Management Systems
Consider a relation R(StudentId, CourseId, Instructor, Grade) with the following functional dependencies: {StudentId, CourseId} → Grade {CourseId} → Instructor If the primary key is {StudentId, CourseId}, which statement is correct regarding 2NF?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1R is in 2NF because all attributes depend on the primary key
- 2R is not in 2NF because {CourseId} → Instructor introduces a partial dependency✓
- 3R is not in 2NF because Grade depends on a non-key attribute
- 4R is already in BCNF since all determinants are candidate keys
Correct answer
R is not in 2NF because {CourseId} → Instructor introduces a partial dependency
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