Column value

Hi everybody…
Please, I try to apply the scenario as shown bellow:.
[Statistic] column used for automatically recorded the number of projects that record by users in [projects name] column, but If there are rows have same projects name in particular day, I want the records value in [statistic] equal (1) for first row and all duplicate values will record (0) value.
Please How can apply that?
Thank you in advance…

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