Counting Unique Items - Please Help...SOS!


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I am having a problem with a forumla I am hoping someone out there can help me with.

What I am trying to do is use a vlookup to give me the amount of unique stores attributed to an email address. OR if it is better to use one of the many SUM options (which one?) to create an additional column to get the SUM I am looking for on WORKSHEET 2 and then use a vlookup to pull that data into WORKSHEET 1?

WORKSHEET 1
Column1 = email address
Column2 = ****This is the column I want to show the number of unique stores that are attributed to the email address**** (There is a many to many relationship. Many email addresses can be attributed to many stores.)

WORKSHEET 2 - The stores.
Column1 = email address
Column2 = store_name

Any help is most appreciated.

Thank you!

MikeMikeMike
 
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