How to find the missing parts of a series

Posted by Bob_Mesibov on Feb 2, 2021 4:48 PM EDT
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My wife has a data table with a unique serial number for each of its records. The table gets frequent edits and she wanted to check which of the numbers might be missing as a result of past deletions. Finding the missing numbers on the command line wasn't hard, but what if the series is more complicated than just plain numbers?

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