double data
 

how can i determine if i have a double data in whole column?
is there a validation to prevent double data entry?

tnx


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xtrmhyper
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double data
 

To use data validation to prevent duplicate entries in Column A, say
Highlight the column and enter the following formula in the appropriat
Data Validation box:

=Countif(A:A,A1)=1


David

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david
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double data
 

To use data validation to prevent duplicate entries in Column A, say
Highlight the column and enter the following formula in the appropriat
Data Validation box:

=Countif(A:A,A1)=1


David

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david
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double data
 

formula is working in typing data only
but when i copy paste validation is not working is there another way?


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