Use Excel data validation to prevent duplicate values in a column Your email has been sent Prevent duplicates before they happen by combining a simple function with data validation. Excel has built-in ...

Excel validation lists avoid blanks and errors with TOCOL(ignore) plus FILTER; the spill range stays stable across worksheets.

If you are looking for an easy way to enhance your Excel data analysis and visualizations you might be interested in learning more about the Filter feature available within Microsoft Excel ...