Q1.25

MCQ1 mark, −0.25

Let r and s be two relations over the relation schemes R and S respectively, and let A be an attribute in R. The relational algebra expression $\sigma_{A=a}(r \bowtie s)$ is always equal to

(A)

$\sigma_{A=a}(r)$

(B)

$r$

(C)

$\sigma_{A=a}(r) \bowtie s$

(D)

None of the above

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