Answer: Sequence check; diagnostic
Step-by-step 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.