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MS Office Forum / Excel / New Users / March 2008preventing duplicate enrties in a column
How do I make a rule that an identical number cannot be entered twice in an Excell column? Mark, Say in a very deep voice: "Thou shalt not enter the same number twice in one column." ;-) Actually, use Data / Validation, with a custom formula of =COUNTIF(A:A,A2)=1 For column A, with A2 the currently active cell. HTH, Bernie MS Excel MVP > How do I make a rule that an identical number cannot be entered twice in an > Excell column?
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