select distinct al, a2,........., an from r1, r2,........, rm where PFor an arbitrary predicate P, this query is equivalent to which of the following relational algebra expressions ? A:
Answer:(A)
Explanation:
Cross product (x) combines the tuples of one relation with all the tuples of the other relation. Thus, tuples of relation r1, r2 …. rn are combined.
Select operator
Projection operator
Thus, option (A) is correct.
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