Excel: Count Only Once If Another Column Has Duplicates

Question

I am trying to create a formula that will count the number of "Overdue" people instead of "Overdue" cells. Each person has the multiple rows with their name in it. The criteria to determine if it's "overdue" is:

-Column F and G are not within 3 years

-Column G are blank

-Column F = 0 and Column G are not within 3 years

The following code counts the criteria accurately. And doesn't account for duplicate names.

=SUM(COUNTIFS(TT[Fiscal Law 301 CBT],"<"&TODAY()-1065,TT[Fiscal Law 301 CBT],">"&TODAY()-1095,TT[Fiscal Law In-Residence],"<"&TODAY()-1065,TT[Fiscal Law In-Residence],">"&TODAY()-1095),COUNTIFS(TT[Fiscal Law In-Residence],"",TT[Fiscal Law 301 CBT],"<"&TODAY()-1065,TT[Fiscal Law 301 CBT],">"&TODAY()-1095))

The formula I want should count based on the criteria above and check column Z TT[Name] for duplicates and count them only once. And also count unique values once.

I just thought of another approach to this problem. What if I use the formula I have to create an Array, have another formula count the number of duplicates in Column Z from that Array, and subtract the two numbers.

This way should get me the correct number, i will still need assistance creating the second formula.

Answer 1

What you are after is a distinct count. Excel has a function for that in the new Dynamic Array function set, which is in Office 365 Insider builds but not available to everyone. Right now, a distinct count requires a few tricks.

For example, you can create a pivot table with the names in the rows, filter the table to include only values where column X = Overdue and use a CountA() on the result rows.

Answer 2

You are close, but not quite there.

Use a countifs formula like above. Then, create a column next to it with the logic if(countcell>0, 1, 0). This will return 1 if the person has at least 1 book overdue, and 0 otherwise. Then, take the sum of that column.

Formulas

I have provided a screenshots of the code that we would use (the E and F columns are dates). As you can see, the G column counts how many books are overdue. The H column provides a 1 if at least 1 book is overdue for each user. Then, we can simply sum the H column to find the total number of users with overdue books.

If this helps you, please consider choosing this as the answer.