If you wish to count the same or duplicate values in a column only once in Excel or the count of occurances of duplicate values, read this article.

Highlighting or even deleting duplicate records in Excel is simple but listing them isn't as easy. Fortunately, you can use Power Query to easily display a list of duplicate values or records.

How to Show Duplicate Records in Excel. As your business grows, so too will the documents and spreadsheets that you use to help keep things running. Eventually, the spreadsheets may get so big ...