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 combine values into a single cell using TEXTJOIN () in Excel Microsoft 365, Excel 2019 and Excel for the web support the function, TEXTJOIN ().

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.