First display promotions in a view I use the "discount" module, I created a view to display my products but I can not find how to display the products on sale first in my view
Hi checkout you view setting 
like this http://prntscr.com/bscbkf
then add filter on it 
http://prntscr.com/bscc0e
now you can see result 
http://prntscr.com/bsccbh
Also explain some more details