Computer Science · Database Management Systems
Consider relations R1(A, B, C, D, E) and R2(A, B, F, G) with primary keys underlined. Which of the following Relational Algebra expressions are equivalent? I. ΠA(R1 ⋈ R2) II. ΠA(R1) ⋈ ΠA(R2) III. ΠA(ΠA,B(R1) ∩ ΠA,B(R2)) IV. ΠA(ΠA,B(R1) - (ΠA,B(R1) - ΠA,B(R2)))
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Only I, III and IV✓
- 2Only I, II and III
- 3Only I and III
- 4Only I and II
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Only I, III and IV
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