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Counting unique records

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Hi guys.

Suppose I have a field called Fruits and ten records on my database like this:

1 Orange

2 Orange

3 Apple

4

5 Orange

6 Grape

7 Apple

8

9 Strawberry

10 Grape

I'm looking for a summary field that would return unique instances of Fruits which in the example above would be 4.

I was thinking of creating two fields. A calculation field that would return zero, if the Fruit field is empty, one for the first instance of each fruit and zero for the remaining fields. Then I could use a summary field Total of or Count of to get the result I want.

Any suggestions?

Thanks in advance.

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