Consider the following SQL query:select distinct al, a2,........., anf – McqOptions

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1.	Consider the following SQL query:select distinct al, a2,........., anfrom r1, r2,........, rmwhere P For an arbitrary predicate P, this query is equivalent to which of the following relational algebra expressions ?
A.	A
B.	B
C.	C
D.	D
Answer» B. B

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