Calculation on server side in Sharepoint Online

Hi,
I'm searching for a solution to make the calculation on server side in Sharepoint Online, because CAML-Query don't have aggregation functions like sum.
My Problem:
I have 3 Lists in Sharepoint Online ("Projects", "Timesheet" , "Project Rates").
The "Projects" list has the columns "Title" , "Amount" , "Invoiced" (this Value should calculate dependent on the Timehseet Entries multiplied with the rate for that specific Project and Employee).
The "Timesheet" list has the columns "Time needed" , "Project" , "Employee".
The "Project Rates" list has the columns "Project" , "Employee" , "Rate".
In the Timesheet list I'll sum the column "Time needed" GroupedBy "Project" and "Employee" and multiply this result with the column "Rate" from the "Project Rates" list,
if the values of the columns "Project" and "Employee" from the "Project Rates" list are the same value as the columns from the "Timesheet" list.
After that calculation a progress bar should display the percentage of "Amount"/"Invoiced".
At the moment I'm using Javascript for calculating the "Invoiced" value and displaying the progress bar in a column of the "Projects" list.
Now, I do not want to make the calculation on client side, because the iteration over the different lists brings the performance down.
greets
Patrick

hi
other options are to implement provider hosted app or regular WCF service in different server, which should communicate with SP online e.g. by using client object model or you will send data for calculation to them. It will move code execution to the server,
but I'm not sure that it will make whole process faster.
Blog - http://sadomovalex.blogspot.com
Dynamic CAML queries via C# - http://camlex.codeplex.com

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