Given two union compatible relations R1(A,B) and R2(C,D), what is the result…
GATE · 1998 · CS · Question 1 subpartsModified — slightly modified from the official paper; see the solution
Given two union compatible relations R1(A,B) and R2(C,D), what is the result of the operation π_{A,B}(R1 ⋈_{A=C ∧ B=D} R2)?
- A.
R1 ∪ R2
- B.
R1 Χ R2
- C.
R1 - R2
- D.
R1 ∩ R2
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