How do I count unique records based on two columns in Excel?

In Excel 2010,  how do I count unique records based on two columns?

For example, I may have a patient that has the following three presecriptions:

Name          Drug                       Dosage
Smith          Simvastatin           40mg
Smith          Simvastatin           20mg
Smith          Omeproezal          20mg
Jones           Cyclobanzaprine  10mg

This should have a count of three (3)

Secondarily, how could I count all unique Name, Drug, Dosage combinations, which in this example would be four (4).

Lastly, how could I count the number of patients with multiple unique prescriptions, which in this example would be two (2).
Michael PaxtonProcess EngineerAsked:
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.

Haris DulicCommented:
Hello,

attached is the file with examples of the formulas, for some formulas I added new columns to concentrate date so that the formula will be less complicated...
COUNTS.xlsx
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
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
Office Productivity

From novice to tech pro — start learning today.