A on an attribute of a relation is a – McqOptions

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1.	A on an attribute of a relation is a data structure that allows the database system to ﬁnd those tuples in the relation that have a speciﬁed value for that attribute eﬃciently, without scanning through all the tuples of the relation.
A.	index
B.	reference
C.	assertion
D.	timestamp
Answer» B. reference

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