Count different string values in a group

I am grouping by a specific field (Transaction Number), within each group I have a specific value that should always be the same within that group. The total group count varies, I want to count how many different values of this specific string are in each group:-

11000012956  (The group count should be 1 as the value is the same within the group)
AA12BBCC
AA12BBCC
AA12BBCC
11000012957 (The group count should be 3 as the value has 3 different values in this group)
DD5612BB
DD56DD12
12DD5611
John-S PretoriusTechnical Service Manager, Mid-AtlanticAsked:
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Ido MilletProfessor of MIS at Penn State Erie and Owner, Millet SoftwareCommented:
Use Distinct Count.
Or, for a more robust solution (in case the string values are not sorted) ,  group at level 2 on that string value and use a Running Total (total) with evaluate for each Group Level 2.
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mlmccCommented:
That sounds like the answer

If you are oing the counts on a group be sure to use the group version of the formula

DistinctCount({Field to count}, {group field})

mlmcc
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John-S PretoriusTechnical Service Manager, Mid-AtlanticAuthor Commented:
Thank you both.
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John-S PretoriusTechnical Service Manager, Mid-AtlanticAuthor Commented:
My apologies that works
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