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In column A I have a series of numbers. How do I keep other users from
entering a number in Column A which is already present in Column A. So, for example A2 has #3451. Another user enters #3451 in A10. I need a prompt to let the user know #3451 has already been used. Thanks in advance. |
#2
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See Chip Pearson's site for using Data Validation to prevent duplicates.
http://www.cpearson.com/excel/NoDupEntry.aspx Gord Dibben MS Excel MVP On Tue, 4 Sep 2007 14:50:02 -0700, Stephanie wrote: In column A I have a series of numbers. How do I keep other users from entering a number in Column A which is already present in Column A. So, for example A2 has #3451. Another user enters #3451 in A10. I need a prompt to let the user know #3451 has already been used. Thanks in advance. |
#3
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You can try this... Place your cursor in Cell A2. Now highlight the entire
column. Now select Data|Validation - Custom In the formula box add =countif(A:A, A2) = 1 You will probably want to change the error alert message, but at this point you should be good to go in terms of only allowing unique entries... -- HTH... Jim Thomlinson "Stephanie" wrote: In column A I have a series of numbers. How do I keep other users from entering a number in Column A which is already present in Column A. So, for example A2 has #3451. Another user enters #3451 in A10. I need a prompt to let the user know #3451 has already been used. Thanks in advance. |
#4
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Hi Jim,
Thank you so much - it worked perfectly. "Jim Thomlinson" wrote: You can try this... Place your cursor in Cell A2. Now highlight the entire column. Now select Data|Validation - Custom In the formula box add =countif(A:A, A2) = 1 You will probably want to change the error alert message, but at this point you should be good to go in terms of only allowing unique entries... -- HTH... Jim Thomlinson "Stephanie" wrote: In column A I have a series of numbers. How do I keep other users from entering a number in Column A which is already present in Column A. So, for example A2 has #3451. Another user enters #3451 in A10. I need a prompt to let the user know #3451 has already been used. Thanks in advance. |
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