Consider relation StudentInfo(sID, name, dorm, major) with functional dependency sID → name and multivalued dependency sID ↠ dorm. What schema would be produced by the 4NF decomposition algorithm?
Question
Consider relation StudentInfo(sID, name, dorm, major) with functional dependency sID → name and multivalued dependency sID ↠ dorm. What schema would be produced by the 4NF decomposition algorithm?
Solution
The 4NF (Fourth Normal Form) decomposition algorithm would decompose the StudentInfo relation into two separate relations to eliminate the multivalued dependency. The schema produced would be:
- Student(sID, name, major)
- Dorm(sID, dorm)
Here, the Student relation contains the student's ID, name, and major. The Dorm relation contains the student's ID and dorm. The student's ID is used as a common attribute in both relations to establish a link between them. This decomposition ensures that each non-trivial multivalued dependency in the relation is a dependency of a candidate key.
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