CREATE TABLE PERSONNE (numpers number PRIMARY KEY, nom varchar(30) NOT NULL, prenom varchar(30), pere REFERENCES PERSONNE(numpers), mere REFERENCES PERSONNE(numpers) ); CREATE TABLE MARIAGE ( nummari NUMBER REFERENCES PERSONNE(numpers), numfemme NUMBER REFERENCES PERSONNE(numpers), datemariage DATE DEFAULT SYSDATE, datedivorce DATE DEFAULT NULL, PRIMARY KEY(nummari, numfemme, dateMariage) );