Computer Science · Relational Calculus
Consider a relation scheme R = (A, B, C), and let r1 and r2 both be relations on schema R. Which expression in Domain Relational Calculus (DRC) is equivalent to r1 ∪ r2?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1{ | ∈ r1, r2 }
- 2{ | ∈ r1, r2 ∧ ∈ r1, r2 }
- 3{ | ∈ r1 ∧ ∈ r2 }
- 4{ | ∈ r1 ∨ ∈ r2 }✓
Correct answer
{ | ∈ r1 ∨ ∈ r2 }
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