Question 1131 – Boolean-Algebra
December 7, 2023Database-Management-System
December 7, 2023Database-Management-System
| Question 32 |
The relational algebra expression equivalent to the following tuple calculus expression:
{t| t ∈ r ∧(t[A] = 10 ∧ t[B] = 20)} is
| σ(A=10∨B=20) (r) | |
| σ(A=10) (r) ∪ σ(B=20) (r) | |
| σ(A=10) (r) ∩ σ(B=20) (r) | |
| σ(A=10) (r) – σ(B=20) (r) |
Question 32 Explanation:
The given relational algebra expression represents tuples having A=10 and B=20 which is equivalent to
σ(A=10) (r) ∩ σ(B=20) (r)
σ(A=10) (r) ∩ σ(B=20) (r)
Correct Answer: C
Question 32 Explanation:
The given relational algebra expression represents tuples having A=10 and B=20 which is equivalent to
σ(A=10) (r) ∩ σ(B=20) (r)
σ(A=10) (r) ∩ σ(B=20) (r)