Group by and SUM function
Grouping my data by calendar month and display the sum of all the days in a month works perfectly fine.
But we have now realized that for most of our customers it would make sense to display data of their billing month which not nessessary means 1st till 30th/31st.
Is it possible to use the sum function and group by month but tell the graph that start and end day are different to 1st and 30th/31st?
Thanks very much for your help.