element calculation

[csantof]

Hi,

I would like to calculate the sum of the "montant pr?t" by column "courtier" and put this result in a table to make the visualization.

do the same with banks and calculate the average "montant pr?t". and count the number of "finalisation".

being zero in php I'm reading everything I find on the calculations I can not seem to apply.

Thanks for your help

Tof