How to use Data Validation for Excel Cells Data validation feature in Excel lets a user control what can be entered into a cell or provide a predefined list of acceptable entries to eliminate ...

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 ...

Combine an Excel custom format with data validation and remove the pressure for input perfection from personnel by letting Excel do the work.