Countif Function In Excel - How To Use It To Avoid Duplicate Entries?

Hi All,
Greetings to you from GLOBALedge.
Please find attached a excel worksheet which describes using COUNTIF function to avoid duplicate entries. This worksheet also uses the DATA VALIDATION option in Excel.
Note: Please enable MACROS while opening this worksheet.
Looking forward to your feedback,
Regards,
RAJA C S N,
Director,
GLOBALedge Training Academy,
Erode 9443498027
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GLOBALedge TRAINING ACADEMY

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Dear Raja,
thanks for such a useful information. If we use MS Access and you put in a key, then this copy past option will not work and Access will not accept an entry with the same data ( to which key has been put up).
Swati

here u go :idea:

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