Web Reference: To prevent duplicate values from being entered into Excel, use data validation and the COUNTIF function. In this article, I will show you how to prevent duplicate entries in Excel using Data Validation. I will also cover a method that instantly highlights duplicate entries using Conditional Formatting. Apr 8, 2025 · Learn how to prevent duplicate entries in Excel using Data Validation, formulas, and built-in tools to keep your data clean and error-free.
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