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John D, BS Degree in Engineering

Category: Mac

Satisfied Customers: 9666

Experience: Worked on Macs and PC's for 20+ years.

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I have three spreadsheets in Excel 2011 Mac.They are attendee

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I have three spreadsheets in Excel 2011 Mac.They are attendee lists for people registered for an conference held in 2009, 2010 and 2011. I need to compare the 2009 list to the 2011 list and get a list of names that attended in 2009 and did not attend in 2011. Same with the 2010 list. I need to get a list of names that attended in 2010 but did not attend in 2011. I know there's a way to compare the sheets and get the names, I don't know how to do it.

Couldn't you put them in a single file. Working with formulas between different files will be hard to set up on one system and make it work and diagnose on another system that has different folder structure

That is correct, we need to send a survey to find why the 2009 and the 2010 people did not attend in 2011. Can you do that? More importantly, can you teach me how to do it? TRANKS

Yes I will send you both the formulas which you will be able to use on other lists, and the result of these lists. Will have them ready in 15 to 20 min...

The formulas are on the first sheet in the yellow cells. Then the contents of these cells was transferred to a new sheet called 'Final' which you can use to copy the lists from in case you want to copy them to other files or documents

Hope this is ok. Please spot check the lists to make sure the understanding is correct.

Let me know if you have any questions, and thank you for clicking Accept if you are satisfied with the solution

John D and 3 other Mac Specialists are ready to help you

column E (attended in 2009 but not in 2011) has this formula

=IF(COUNTIF($C$2:$C$1556,A3)>0,"",A3) This forumla Searches the C column to see if there is a match in column A. If there is a match it displays the email from column A, if not, it returns a black.

column F (attended in 2010 but not in 2011) has this formula

=IF(COUNTIF($B$2:$B$1216,A2)>0,"",A2) Does this forumla search column C to see if there is a match in column B? I'm looking for people that attended in 2010 Dallas (Column B) but did not attend in 2011 Nashville (column c)

I need to know the formula to look in column c and see if there is a match in column A AND column B and if there is a match, return that email to a new column is no match return blank cell.

So that would be the attendees who attended in 2009 Vancouver AND 2010 Dallas but did NOT attend in 2011 Nashville.

I can't figure out the part of the formula that checks those two columns at the same time.

If you want me to post this as a new questions, I can do that.

If I understand you correctly, that would require two more columns with formulas and each formula would have two conditions to check

First column would take A2 and look for a match in col B. If found then look for a match of A2 in col C. If not found in C then return the value of A2

Same will apply to the next column, but instead of taking A2 it would take B2

If so I am afraid this is a much more complicated set of conditions and I think you should consider this as a new question (but you can still post it on this page if you like)

No you do not need to do anything now. I will be posting the file here in a couple of hours. You will have the chance to accept the answer if you are satisfied with the solution

She attended Vancouver 2009 and Dallas 2010 but did not attend Nashville 2011 So her email is in Column A (2009), B(2010), E,(in 2009 but not in 2011) F(in 2010 but not in 2011) H (attended in 2009 and 2010 but not in 2011)

Should her email address be in column I as well (attended in 2010 and in 2009 but not in 2011)

I'm just not clear on what the two new columns represent? How are they different?

I added a new column which takes care of and removes all repetitions and shows only the final unique list. This would be your final column, hence columns H, I and J can be kept hidden