An index can only be built over a field that has unique values.

Name: An index can only be built over a field that has unique values.
Brand: Quizplus
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Quizplus · Accepted Answer

An index can be built over fields that do not have unique values. Indexes are used to improve the speed of data retrieval and can be created on both unique and non-unique fields. Unique indexes enforce uniqueness for the indexed field, while non-unique indexes do not.

An Index Can Only Be Built Over a Field That