Supprimer 'DEV2.1/tp5.txt'
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insert into Auteur values (1, 'Proal');
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insert into Auteur values (2, 'laorP');
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insert into Auteur values (3, 'alPro');
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insert into Auteur values (4, 'orPal');
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insert into Editeur values (8, 'CrocsCars');
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insert into Editeur values (9, 'Fesse');
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insert into Editeur values (10, 'LaGlance');
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2)CREATE TABLE Livre(NumLivre number primary key, Titre varchar(60), CodeEditeur number references Editeur ON DELETE SET NULL);
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insert into Livre values(13, 'Heehee', 8);
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DELETE FROM EDITEUR WHERE CodeEditeur = 8;
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3)
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CREATE TABLE A_ECRIT(NumAuteur number references AUTEUR ON DELETE SET NULL , NumLivre number references LIVRE ON DELETE CASCADE, Primary key(NumAuteur,NumLivre));
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insert into A_ECRIT values (1, 14);
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insert into A_ECRIT values (2, 14);
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