There are things that I know you must be able to do, but have no idea how. As such, I often default to loading data into SQL Server to manipluate. When dealng with large quantities of data, I think this is still the best thing to do, but for smaller datasets, using Excel makes more sense.
There may be a number of other posts, covering fairly simple functionality in Microsoft Excel, that I post in future as reminders for myself.
The first of these Excel tips, is identifying unique data. In Excel this is actually quite simple (once you know how).
If I wanted to identify how many unique vendor ids I had in a dataset, I can do this in only a small number of steps.
Select the columns containing the data I want to search; in this case, the Vendor ID and Vendor Name columns. Select the DataSort & Filter section, click Advanced: