Put 1 as value of the next column for every first time a value appears on the adjacent column

Z

Zedrick13

Board Regular
Joined
Sep 8, 2018
Messages
100
Please help me with coming up with a formula so that the value "1" appears on the corresponding row of a column for every first instance a code appears on another column. Like this:

Code: 
         A        B
1    GL23      1
2    GL45      1
3    GL45        
4    GL50      1
5    GL23        
6    GL23        
7    GL45       
8    GL51      1

So, like in the example above, I want the value "1" appear on the next column (Column B) whenever a code appears for the first time in Column A.

Thanks in advance!
 

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Upvote 0
Thank you very much, oldbrewer!

oldbrewer said:
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<tbody>[TR]
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[TD="colspan: 4"]=IF(COUNTIF($A$1:A1,A1)=1,1,"")[/TD]
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