List unique cases  

This tool extracts unique values from a column in a database.
"So that -in a very simple way- we could make category tables (or stratification table), which will allow us to perform a stratified analysis to our database and make better decisions."
The procedure is very simple:
"1. Select a database or just place in any cell in the database (in this case the tool will automatically detect and select the database in the spreadsheet)"

2. Click on the Extract unique cases button in the toolbar.
3. The corresponding dialog will appear. Select the field you want to analyze.
4. Click OK in the dialog.

That would be it. A new spreadsheet with unique cases will be created. With this results you may create a stratification table and stratify your database.