Detecting gaps in records and duplicate entries is referred to as and is an example of analytics.

Sequence check; diagnostic

Explanation:

A sequence check is carrying out test on a list of items for accurate order in which they are arranged or are placed based on the key item with which they are being identified.

Diagnostic analysis takes a deep insight into a study(descriptive analysis) then finds out the cause of such outcome.

Detecting gaps in records and duplicate entries is referred to as a sequence check which is a type of diagnostic analysis.

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