Group by columns unique table

Hi all,

I would like to group only one of my table from my dashboard with a column date. 

Actually my table is :

CPC          Date_day

0,4           1

0,3           1

0,3           2

0,5           2

And I would like to have the tab group by date_day, to have this :

CPC          Date_day

0,7           1

0,8           2

Anywone knows how I could do ?

Cheers