Prevent duplicates from a range of cells

MadBern

New Member
Joined
May 10, 2019
Messages
37
Hi,
This probably has a really simple solution, but I can't seem to figure it out...
I'm trying to use Data Validation to prevent duplicates in some cells. It's easy enough to do this when it only has to look for the value in one spesific cell, but I need it to look in several.
I've tried many variations of AND, OR and COUNTIF.

Example:
I need it to return an error if someone tries to type in the same value in A3 as is found in the range A1:C2.


Any one got any clues?


- Mads
 

Excel Facts

What is the shortcut key for Format Selection?
Ctrl+1 (the number one) will open the Format dialog for whatever is selected.
Hey, try use a custom data validation rule with COUNTIF.

In your example given, select cell A3 then make the rule as follows:
=COUNTIF(A1:C2,A3)=0
 
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