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How would I identify each unique subject ID in the attached  excel spreadsheet.

Posted on 2014-10-25
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Last Modified: 2014-10-28
I have an excel spreadsheet with several thousand subject ID entrees in column A and most are repeated many times.

How would I extract the unique subject IDs into a separate column C in the excel spreadsheet?  Please see attached example.

Thanks,
EE.xlsx
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Question by:PDSWSS
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Accepted Solution

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Ejgil Hedegaard earned 500 total points
ID: 40404167
Copy all values to column C, and use the Remove Duplicates function on the Data tab.
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Author Comment

by:PDSWSS
ID: 40404176
Thank you.  You answered my question and will give you the points.
However, I should have been clearer. I wanted to delete the rows that included the duplicate subject IDs as well.

Could you answer this one or should it be a separate question.  Thanks again.
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Author Closing Comment

by:PDSWSS
ID: 40404345
Thanks for the quick solution.
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LVL 22

Expert Comment

by:Ejgil Hedegaard
ID: 40405100
Use the Remove Duplicates on column A instead.

Or insert this formula in B2 =IF(COUNTIF($A$2:A2,A2)>1,"Remove","Keep")
Copy down, double click on the black square in the lower right corner of the cell marker.

Mark result in column B.
Copy and paste as values (=Right click somewhere in column B, select Insert special in the menu, select values, Ok)
Sort on column B, to get "Remove" at the bottom of the list.
Then delete all with "Remove" in column B.
Delete the result "Keep" in column B.

You can also filter on column B to show only "Remove", select all rows, (entire rows) in the list, right click and select Delete rows.
Delete the formulas in column B.
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Author Comment

by:PDSWSS
ID: 40409342
Thank you very much.
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