Running Total in Ms-access query using SQL - sql

Question

I want to calculate running total in one of my access queries using SQL ( no DSUM please).
I have 3 fields in my existing query Namely SubCategoryID, brand and Revenue and would like to calculate the running total of the revenue under each SubCategory.
I've written a query for it, but there is some error and I cant find a way to correct it.
SELECT x.SubCategoryID
,x.brand
,x.[Avg Revenue]
( Select Sum(x2.[Avg Revenue])
From FROM [BrandRevenue] x2
Where x2.[SubCategoryID] = x.[SubCategoryID] AND x2.[Avg Revenue] <= x.[Avg Revenue]) As [Running Sum]
FROM (Select SubCategoryID, brand, [Avg Revenue]
FROM [BrandRevenue]
Order BY SubCategoryID, [Avg Revenue] DESC) As x
Group BY x.SubCategoryID, x.brand, x.[Avg Revenue];
Thanks for helping :)

Answer 1

You have repeated "From" in your correlated subquery:
( Select Sum(x2.[Avg Revenue])
From FROM [BrandRevenue] x2
...
I don't think you need the subquery in the from clause, or the GROUP BY either. I think this will be better, and certainly simpler:
SELECT x.SubCategoryID,
x.brand,
x.[Avg Revenue],
( SELECT SUM(x2.[Avg Revenue])
FROM [BrandRevenue] x2
WHERE x2.[SubCategoryID] = x.[SubCategoryID]
AND x2.[Avg Revenue] <= x.[Avg Revenue]
) AS [Running Sum]
FROM BrandRevenue AS x
ORDER BY x.SubCategoryID, x.[Avg Revenue] DESC;
ADDENUM
I think to get around the problem of Brands having the same revenue you will need to add some additional logic to your correlated subquery:
SELECT x.SubCategoryID,
x.brand,
x.[Avg Revenue],
( SELECT SUM(x2.[Avg Revenue])
FROM [BrandRevenue] x2
WHERE x2.[SubCategoryID] = x.[SubCategoryID]
AND ( x2.[Avg Revenue] <= x.[Avg Revenue]
OR (x2.[Avg Revenue] = x.[Avg Revenue]
AND x2.Brand <= x.Brand
)
) AS [Running Sum]
FROM BrandRevenue AS x
ORDER BY x.SubCategoryID, x.[Avg Revenue] DESC, x.Brand;