how to make number unique in Excel column?

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

I am entering a long list of ID numbers. Can I get Excel to reject ID if it
has already been used?
 
Bob, you can use data validation to keep people from putting duplicate
numbers in a column, select column A, data, validation, custom, formula: =
COUNTIF($A:$A,A1)<2
--
Paul B
Always backup your data before trying something new
Please post any response to the newsgroups so others can benefit from it
Feedback on answers is always appreciated!
Using Excel 2002 & 2003
 
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