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

You can remove duplicates in Excel in a few steps. Duplicates can create problems when you're dealing with data.

Learn three methods to easily remove duplicates in Microsoft Excel spreadsheets to improve your data analysis in 2024. Copies of Excel data ...

Duplicate entries may be valid -- but when they aren't, they can derail your summaries and totals. Use Excel's Validation feature to reject duplicate entries.