A functional dependency X → Y means that ________.
Options
- A. X uniquely determines Y
- B. Y uniquely determines X in every case
- C. X and Y must always be primary keys
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
A. X uniquely determines Y
Detailed Explanation
- Functional dependency: X → Y means that each value of X is associated with exactly one value of Y in a relation.
- X is called the determinant.
- Y is functionally dependent on X.