Creating Uniques Values in a Cell (Order nos etc)

franck

New Member
Joined
Apr 15, 2002
Messages
20
Is there anyway you can assign a column in a spreadsheet to not accept duplicated information ie an order number?

Regards Franck
 

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Russell Hauf

MrExcel MVP
Joined
Feb 10, 2002
Messages
1,611
Yes, there is. Highlight the column you wish to do this to (click on the column letter, "M", for example). Then click on Data - Validation (Data menu inbetween Tools and Window).

When the dialog comes up for Data Validation, in the Allow box, select Custom. Then in the Formula: box, type:

=(COUNTIF(M:M,M1)=1)

Then if you like, you can click on the "Error Alert" tab, and enter a custom message, like "Duplicate entry - please try again."

HTH,

Russell
 

rajeevbhardwaj

New Member
Joined
Oct 27, 2002
Messages
13
hi russell...it was very useful for me too, thanks..can yu please tell me what is the significance of =1 at the end of yur formula..that has me stumped..i understand countif formula but this one??
 

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