I am trying to figure out how many months a salesman has worked in a given year. example: Column A has Salesman A, Salesman B and Salesman C. Column B has the date. Some salesman will have multily sales in a month. How can I ask excel to tell me how many months a salesman has worked.
Salesman A 1/5/11
Salesman B 1/5/11
Salesman B 1/10/11
Salesman A 2/15/11
Salesman B 2/20/11
Salesman C 2/25/11
Answer should be
Salesman A = 2
Salesman B = 2
Saleman C = 1
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