How do I compare two Excel columns of numbers and see non-matches

[Tcom]

I am creating a template to use when comparing a list of telephone numbers,
received on a monthly invoice, against an inventory list of telephone numbers
and want to generate a list of the numbers contained in the monthly invoice
that do not appear in the inventory. Each list is a column in Excel on the
same worksheet and in number format. I have tried using functions that
compare one cell reference (i.e. a cell containing a number from the monthly
invoice) against a range of numbers (i.e. the column of cells containing the
inventory list). The function I have used successfully only works when the
number being searched for is at the top of the range. If the number being
searched for is somewhere else in the range it is not recognized.

 

[George Nicholson]

Are you using Vlookup? What are you using for the 4th argument
(Range_Lookup)? It can be True (the default if omitted) or False.
If True/Omitted (i.e., approximate match) then your inventory list needs to
be sorted ascending. If False (i.e., exact match) then sort order doesn't
matter.

If you have it set to False (which sounds like what you want) and you still
only get matches from the begining of your range, double check that the
specified range really corresponds to the length of your inventory list.

(If you have it set to True and your list isn't sorted, that's one problem.
A True setting won't "see" anything past the point where it encounters a
number that is smaller than the previous one. Anyways, I don't think you
want approximate matches (the 2nd problem), so you should be specifying
False.)

HTH,