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3 must-know custom data validation formulas for preventing errors in Excel

Select all the relevant cells, and in the Data tab, click the main part of the split "Data Validation" button. Then, click ...
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How to use UNIQUE() to populate a dropdown in Microsoft Excel

How to use UNIQUE() to populate a dropdown in Microsoft Excel Your email has been sent Populating a dropdown with a dynamic list is easy thanks to Microsoft Excel’s UNIQUE() dynamic array function.
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Use Excel data validation to prevent duplicate values in a column

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 ...