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 ...

Microsoft Excel offers several tools you can use when you need to fill a column with the same text or numbers. Instead of completing each cell manually, you can quickly fill in the entire column ...

Microsoft Excel makes it possible for users to easily get around incorrect data entries. In most cases, the user takes advantage of the data validation feature.

The Data Validation window that pops up allows you to set your criteria in many ways. For our example, choose Whole Number for Allow:, greater than or equal to for Data:, and -700 for Minimum:.