Скачать или смотреть Excel Hack: Restrict Duplicates Using Data Validation

🚀 Stop Duplicate Entries in Excel with This Simple Trick! 🚀

In this video, I’ll show you how to prevent duplicate entries in Excel using Data Validation without using VBA. This is an essential technique for ensuring clean and accurate data in your spreadsheets.

🔥 What You’ll Learn:

✅ How to use COUNTIF in Data Validation
✅ Step-by-step guide to restrict duplicate values
✅ Practical example with an employee list
✅ How to display an error message when duplicates are entered

🎯 Perfect for:
✔️ Data Analysts
✔️ Excel Beginners & Experts
✔️ Business Professionals
✔️ Anyone who works with large datasets

📌 Formula Used:

=COUNTIF($A$2:$A$20, A2)=1

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