Is there a way to return the row location of all instances of a duplicate value within a column?

Jim Rood

I've created a duplicate flag column using the following formula: =COUNTIF(Email1, Email1) + " of " + COUNTIF(Email:Email, Email1).

This shows the instance and the count. What I would like to be able to do is provide the row numbers of the duplicate emails. Match will only find the firs duplicate but won't return all of the duplicates.

Thanks for whatever assistance you can provide.

Paul Newcome

You would need to add in a column that essentially replicates the sheet row number first.

=COUNTIFS(Email$1:Email@row, OR(@cell = "", @cell <> ""))

Then you can use a JOIN/COLLECT similar to...

=JOIN(COLLECT([Row #]:[Row #], Email:Email, Email@row), ", ")