The difference (−) operation removes common tuples from the first relation.…
2018
The difference (−) operation removes common tuples from the first relation. This operation is —
- A.
commutative and associative
- B.
non-commutative and associative
- C.
commutative and non-associative
- D.
non-commutative and non-associative
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Correct answer: D
For relations A − B: A − B ≠ B − A ⇒ not commutative
(A − B) − C ≠ A − (B − C) ⇒ not associative
So, difference operation is non-commutative and non-associative.