Find the differences between 2 Excel worksheets?

Question

I have two excel files with the same structure: they both have 1 column with data. One has 800 records and the other has 805 records, but I am not sure which of the 5 in t

Answer 1

COUNTIF works well for quick difference-checking. And it's easier to remember and simpler to work with than VLOOKUP.

=COUNTIF([Book1]Sheet1!$A:$A, A1) 

will give you a column showing 1 if there's match and zero if there's no match (with the bonus of showing >1 for duplicates within the list itself).