How to Restrict duplicate data entry in a column in Excel

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How to Restrict duplicate data entry in a column in Excel. Using the Data Validation Custom formula feature, you can enter a Countifs formula and not allow duplicate data entry by user. Once you disallow duplicate entry, cleanliness of data is automatically done.

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Комментарии
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Amazing! This helps my team solve major RSVP issues!

avinaashbodwaani
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Respected Sir, above formula has run successfully, thanks, but problem arise when I copy some numerical data from Ms word to this Excel sheet, the formula does not working, sir please give some solutions kindly. Regards

sumantaghosh
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i have restricted duplicate entry in column A in data validation with
=COUNTIF($A$2:A99, A1)=1 but along with this i want to
restrict charactor entry to Max 30 Charactor how to do ? if more then 30
charactor is entered it should give error message

deepakbhanushali
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