Prevent duplicates before they happen by combining a simple function with data validation.

Excel's data validation feature is more versatile than you might think. Learn how to use literal values, input values, list values, and even formulas to restrict input date values using data ...

Clear all the Data Validation values for the targeted cell or the range of cells. Open the Data Validation table by following the steps provided in the above fix.

Learn to create efficient, interconnected Excel drop-down lists using range functions and data validation techniques. Multi-level drop-down ...

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 ...

Understand the different types of validation including length checks and lookup tables. Learn how they can be used to check different groups of data.