drop view Historique_Mars;

create view Historique_Mars
(Identifiant_Client,Nom_Client,Mars_HT,Mars_TTC)
as select 
f.Identifiant_Client,
f.Nom_Client,
f.Prix_HT,
f.Prix_TTC
from Facture f
	where to_char(f.Date_Commande,'MM')= '03'
	order by f.Identifiant_Client; 