Count of uniques in one column based on criteria in another column

Column B contains primarily 4-digit numbers stored as text, with the balance of rows that are either blank or have a single word in the cell (I don't have control of how this data is entered, unfortunately). Column C contains initials + date, with some rows that include "N/A" at the end, as shown below:

Column C
MN–18 Jun 14
MC–16 Jun 14 N/A
AC–13 May 14
MN–25 May 14 N/A

I would like a formula that returns a count of the # of unique 4-digit characters in Column B for all the rows where Column C doesn't not contain "N/A".

I've attached a sample spreadsheet.

Thanks!
Andrea
--of-unique-book-IDs.xlsm
AndreamaryAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

barry houdiniCommented:
Hello Andrea,

When you say "unique" I'm assuming you really mean "different", i.e. the number of different 4 digit codes

I used this formula

=SUM(IF(FREQUENCY(IF(RIGHT(C2:C1000,3)<>"N/A",IFERROR(B2:B1000+0,-1)),IFERROR(B2:B1000+0,0)),1))

confirmed with CTRL+SHIFT+ENTER

and that gave me a result of 322

regards, barry
0
AndreamaryAuthor Commented:
Hi Barry,
Thanks for the quick response. I was verifying the result of 322 by doing this manually (filtering out the n/a's in column C, then filtering out all but the 4-digit numbers in column B, copying and pasting results of Column B into a new sheet and using "Remove duplicates") and I got 321. I did it several times, always with the same result of 321. Is there a chance the heading is being included in the formula, giving the result of 322?

Andrea
0
barry houdiniCommented:
Yes, you're right, apologies - I tried adjusting that formula several different ways without success so try this different approach to get 321

=SUM(IF(ISNUMBER(MATCH(ROW(INDIRECT("1:10000")),IF(RIGHT(C2:C1000,3)<>"N/A",B2:B1000+0),0)),1))

still confirmed with CTRL+SHIFT+ENTER

regards, barry
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
AndreamaryAuthor Commented:
Works like a charm...thanks, Barry, much appreciated!

Cheers,
Andrea
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Excel

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.