MS Access: Average with many condition

Question

Ms Access 2020

I need to add an Average_Quantity column

Average_Quantity = Average of (Quantity of employees who have ticked 'x' on the Average(Y/N) column at every Day and every shift)

Here is the

with the Average_Quantity column

I am trying to use SQL function: AVG OVER PARTITION BY but it seems not working in SQL access

Someone could suggest any solution for this?

Answer 1

In MS Access, you cannot use a window function -- which is the simplest method. An alternative is a correlated subquery:

select t.*,
       (select avg(t2.quantity)
        from t as t2
        where t2.day = t.day and t2.shift = t.shift and 
              t2.[Average(Y/N)] = t.[Average(Y/N)]
       ) as group_average
from t;