Computer Science · Database Management Systems
Consider the relational schemes R(A, B, C) and S(D, E, F). Given the relational algebra expression: ΠA, F(σC=D(R × S)) Which of the following tuple relational calculus (TRC) expressions is equivalent to the above expression?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1{ t | ∃p ∈ R ∃q ∈ S (t[A] = p[A] ∨ t[F] = q[F]) }
- 2{ t | ∃p ∈ R ∃q ∈ S (t[A] = p[A] ∨ t[F] = q[F] ∨ p[C] = q[D]) }
- 3{ t | ∃p ∈ R ∃q ∈ S (t[A] = p[A] ∧ t[F] = p[F] ∧ p[C] = q[D]) }
- 4{ t | ∃p ∈ R ∃q ∈ S (t[A] = p[A] ∧ t[F] = q[F] ∧ p[C] = q[D]) }✓
Correct answer
{ t | ∃p ∈ R ∃q ∈ S (t[A] = p[A] ∧ t[F] = q[F] ∧ p[C] = q[D]) }
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