Calculate a sum by date

Question

I had an Excelsheet imported in siena.
First column is Date (01/01/2011 for example) - second column is a Value. For each day i have one row and each new day i add one value. (Date and Value)
In siena i would like to calculate a sum from the beginning of the actual month until  today. And i would like to show the result in a lable.
After that i would like to add a 2nd Label an show the sum from the beginnig of actual month (1 year ago) to today (on year ago).
I would like to place both lable on the mainscreen. I tried a lot of different things but i didn't get the solution. Maybe it is very simple, but ....
Thanks for helping me soon and greetings from
Hermann

Answer 1

Hi Hermann123, thanks for using Siena! Below is the expression that works for me for the "need the sum of all values in the current month before today".
Let's assume that you have an Excel table named Table1. The table has 2 columns named "MyDate" and "Val", the first being Date format, the second being Number format in Excel. Let's assume you have imported the table in Siena Beta2. Given
the above assumptions, do the following:
1) Add a label
2) Set this expression for the Text property of the label:
Sum(Filter(Table1, Year(Today()) = Year(MyDate) && Month(Today()) = Month(MyDate) && Day(Today()) >= Day(MyDate)), Val)
Allow me to explain in a bit more depth
what the expression does and how I arrived to it.
Since we want to sum over multiple rows, we need to use the Sum function for a table (http://siena.blob.core.windows.net/beta/ProjectSienaBetaFunctionReference.html#_Toc373745529).
I usually start with summing *everything* in the Val column: Sum(Table1, Val)
Now it's time to narrow down the rows by filtering out the rows we don't want included. Therefore instead of Table1 I need to use something like Filter(Table1, <some_condition>)
Now let's start entering the desired condition. First we want the year to match:
Sum( Filter(Table1, Year(Today()) = Year(MyDate), Val)
Notice the <some_condition> now becomes Year(Today()) = Year(MyDate). Basically the condition is true only if the today's year matches the year in the current row of the Excel table. The Siena table-functions take care of running the condition check
for each row of the table.
Next, we want the month to match:
Sum( Filter(Table1, Year(Today()) = Year(MyDate) && Month(Today()) = Month(MyDate), Val)
To finish off, we need to incorporate the "give me only past days or today in the current month" requirement. This should be easy now:
Sum( Filter(Table1, Year(Today()) = Year(MyDate) && Month(Today()) = Month(MyDate) && Day(Today()) >= Day(MyDate), Val)
Enjoy and thanks again for using Siena!
Manski