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

A dynamic data validation list, built using functions like `UNIQUE`, `SORT`, and `VSTACK`, allows users to filter and group data efficiently.

How to base a data validation dropdown on an array in Excel Now we’re ready to create the data validation dropdown that will display the unique list in column H.

Learn how to create a drop-down list using Data Validation in Excel. Data Validation limits the type of data that can be entered into a cell.

If you see the "This value doesn't match the data validation restrictions defined for this cell" error in Excel, this article will help you.