Eliminating Duplicate Rows (keeping first duplicate)
I know this has been discussed before, but I'm looking for suggestions for my particular situation. I have a very large data table (~50 columns x 50,000+ rows). I need to check for "duplicate rows", where duplicate means the rows match in three columns (eg. ColA, ColB, and ColC). When duplicates exist, I need to delete all except the first of the matching rows.
Ideally, I'd like to do this with ...
