A functional dependency X → Y is trivial, if —
2021
A functional dependency X → Y is trivial, if —
Answer: B. X ⊇ Y — A functional dependency X → Y is trivial when: ➡ Y is a subset of X That means: ✔ All attributes of Y are already contained in X This is written as: ➡ X ⊇ Y…
- A.
X ⊂ Y
- B.
X ⊇ Y
- C.
X ≠ Y
- D.
None of the above
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Correct answer: B
A functional dependency X → Y is trivial when: ➡ Y is a subset of X That means: ✔ All attributes of Y are already contained in X This is written as: ➡ X ⊇ Y Therefore, the dependency is trivial.
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