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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.

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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

I got this question by my school principal while I was bunking the class.

This question is from SQL Data Types and Schemas in chapter SQL : Queries, Constraints and Triggers of Database Management

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Correct option is (a) Index

Easy explanation - Index is the reference to the tuples in a relation.

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