Which of the following Relational Algebra operations is/are eliminating duplicates?
A. SELECTION (σ)
B. PROJECTION (∏)
C. UNION (U)
D. All of the above
Answer:B
Which of the following Relational Algebra operations is/are eliminating duplicates?
A. SELECTION (σ) B. PROJECTION (∏) C. UNION (U) D. All of the above