Compare lists in excel [duplicate]

Question

Possible Duplicate:
Extract values from a range that are missing from another

I have two vertical lists. I need to compare the two with each other and get the names that are NOT included in both lists.

ListA | ListB
----- | ------
ABC   | ABC
DEF   | DEF
ASD   | GHI
      | ASD

Should return:

GHI

Answer 1

Add this to C1 (assuming you're starting at A1 and B1) and drag down for the full length of the list.

=CONCATENATE(IF(COUNTIF(A:A,B1), "", B1), IF(COUNTIF(B:B,A1), "", A1))