"How To Excel" Mini-Tutorials
by TheExcelAddict.com
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Preventing Duplicate Entries In A Range Of Cells

If you want to prevent duplicate entries in a range of cells, you can use Excel's Data Validation feature.

Let's assume you want to prevent duplicate entries in cells B5:B50.

  1. Select cells B5:B50.
  2. Choose Data, Validation .
  3. Click the Settings tab .
  4. Click the dropdown arrow in the Allow: box and select Custom. A new Formula box appears.
  5. Click in the Formula box and enter the formula =COUNTIF($B$5:$B$50,B5)=1.
  6. Click on the Error Alert tab and type Duplicate Entry in the Title box.
  7. In the Error message box type You cannot enter duplicate values in this list!
  8. Click OK.

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