

How to Avoid Duplicate Entries in MS Excel Using Data Validation And COUNTIF 

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How to avoid
duplicate
entries in an Excel worksheet using data validation & COUNTIF()
How can you avoid duplicate entries right from the beginning of your work in Excel: Use data validation in combination with the countif function. References to cell ranges in the countif function must be 'absolute'. Watch the Excel training video to see how the process can be easily implemented. How to implement the process:




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