Let r and s be two relations over the relation schemes R and S respectively,…
2001
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
σA = a (r ⋈ s) is always equal to
- A.
σA = a (r)
- B.
r
- C.
σA = a (r) ⋈ s
- D.
None of the above
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Correct answer: C
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