Is it possible to export aggregated data

[Fredericld]

Hi,

I need to export a CSV file containing aggregated data

% of books read, % of damaged book, % of books not returned

and I am quite sure how to handle with the library

I need to run several queries, process the data and calculate the percentages.
Is this something that can be done with this library or is it best to write my own script

I have several thousands records to process