Unfortunately, it is much too easy for a data entry clerk to assign duplicate account numbers. And this is a disaster waiting to happen. To prevent this from happening, use Excel’s Data Validation tool. In this short video lesson, I show you how to use the =COUNTIF() function in the Data Validation dialog box to ensure that only unique account numbers can be assigned to your customers.
I also show you how to extend the range of cells that contain this data validation rule: You use the Paste Special – Validation command.
This is one of “The 50 Best Tips for Excel 2007.” Click here to purchase the DVD using my secure shopping cart.
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