Hi!



This seems to be repeating topic in my tech life as an engineer, I do things but no idea how.

So my problem is the simplest I guess. How to compare 2 columns and see if there are common values.

I have even resolved somehow by cutting&pasting from here and there and changing values randomly. But I have not understood the sintax of this formula:

=INDEX($A$1:$A$12, SMALL(IF(COUNTIF($B$1:$B$12, $A$1:$A$12), ROW($A$1:$A$12)-MIN(ROW($A$1:$A$12))+1, ""), ROW(A1)))

Would any one be able to describe me in layman terms what I have done?

I add a pic of the result.

Additional question would be: Is there a way to have the number of occurrences rather than the string repeated in column C?
The fact that I don't understand the sintax is not helping me to be flexible enough to change it.

Also, is all that mess really needed?
In the beginning I was looking in this area:

=IF(ISERROR(MATCH(A1:A210,$B$1:$B$33,0)),"",A1)

or

=IFERROR(IF(VLOOKUP(B1,$A:$A,1,FALSE)=B1,"x"),"")



But I have not been able to make it work. Of course because basically I don't understand what I am doing.

Many thanks!

Attached Images

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