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Compare 2 Columns To Find Unmatched Values


Is there a function to compare 2 columns to find all of the values from one column that are not in the other column? Basically my data looks like this:
A........................B.................C
procedure1...........................225-3
........................ 25-1...........22-2
.........................33 .............457
procedure2...........................33-55
.......................35-12...........25-6
.......................12-8.............25-1
procedure3...........................33-89
.....

I have another list of data (just the numbers like columnB) that I want to put in column C and see what is in column C that isn't in column B. The numbers will be arranged in a different order, and there will be data in column B that isn't in column C. What I need to do is find out what is in column C that isn't in column B so that I can go back and define what procedure they fit into (that is a seperate process).


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[data] ...

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[url]

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Compare Columns; Remove Matches
I've been searching for a method to compare two large columns of numbers and remove replicates from the "main" column. Column A has all the numbers that are in column B and many more. I want to remove all the numbers from column A that are in column B. The result being two columns with no matching numbers. (or a third column that has only the numbers from 'A' that are not in 'B').

My search results on this forum have found results that compare rows for matches & can make deletions; and also one method that could mark all the entries that were duplicates in both columns, but nothing to remove them. The datasets I am using have over 400k entries in some columns, so manual removal of marked ones is not feasible. I need an automatic deletion method.

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