Summarise data by a criteria which is in another matrix

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In the attached simple model, I have a table named Marks which contains marks by student by course. In another table named Demographics, I have the students names and gender. I want to populate a third table, named Marks by Gender, based on the average marks by gender for each course. How can I do that ?
Many thanks in advance

vpluchet Answered question October 29, 2018