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CREATE TABLE Studenti( id integer NOT NULL AUTO_INCREMENT, nome varchar(255), cognome varchar(255), classe integer, sezione varchar(2), PRIMARY KEY(id) ); CREATE TABLE Materia( id integer NOT NULL AUTO_INCREMENT, nome_materia varchar(255), nome_docente varchar(255), cognome_docente varchar(255), PRIMARY KEY (id) ); CREATE TABLE Registro( id integer NOT NULL AUTO_INCREMENT, voto integer, id_studente integer, id_materia integer, PRIMARY KEY(id), FOREIGN KEY (id_studente) REFERENCES Studenti(id) ON DELETE CASCADE, FOREIGN KEY (id_materia) REFERENCES Materia(id) ON DELETE CASCADE ); INSERT INTO Studenti(nome, cognome, classe, sezione) VALUES ('Gian Tommaso', 'Sanna', 4, 'BS'); INSERT INTO Studenti(nome, cognome, classe, sezione) VALUES ('Simone', 'Foschini', 4, 'BS'); INSERT INTO Studenti(nome, cognome, classe, sezione) VALUES ('Caterina', 'Rocca', 4, 'BS'); INSERT INTO Studenti(nome, cognome, classe, sezione) VALUES ('Carlo', 'Monti', 4, 'BS'); INSERT INTO Studenti(nome, cognome, classe, sezione) VALUES ('Veronica', 'Cimbri', 4, 'BS'); INSERT INTO Studenti(nome, cognome, classe, sezione) VALUES ('Giovanni', 'Sabbioni', 4, 'BS'); INSERT INTO Studenti(nome, cognome, classe, sezione) VALUES ('Alessandro', 'Cesaretti', 4, 'BS'); INSERT INTO Studenti(nome, cognome, classe, sezione) VALUES ('Veronica', 'Legnani', 4, 'BS'); INSERT INTO Materia(nome_materia, nome_docente, cognome_docente) VALUES ('Scienze', 'Alfreda', 'Zanforlin'); INSERT INTO Materia(nome_materia, nome_docente, cognome_docente) VALUES ('Filosofia, Storia e Religione', 'Giacomo', 'Bettini'); INSERT INTO Materia(nome_materia, nome_docente, cognome_docente) VALUES ('Informatica', 'Alessandro', 'Serra'); INSERT INTO Registro(voto, id_studente, id_materia) VALUES (10, 1, 3); INSERT INTO Registro(voto, id_studente, id_materia) VALUES (2, 1, 2); INSERT INTO Registro(voto, id_studente, id_materia) VALUES (3, 4, 1); INSERT INTO Registro(voto, id_studente, id_materia) VALUES (2, 4, 3); INSERT INTO Registro(voto, id_studente, id_materia) VALUES (8, 3, 3); INSERT INTO Registro(voto, id_studente, id_materia) VALUES (9, 3, 3); SELECT nome, cognome, AVG(voto) as Media, COUNT(voto) as NumeroVoti FROM Studenti, Materia, Registro WHERE id_materia = Materia.id AND id_studente = Studenti.id GROUP BY nome, cognome; DELETE FROM Studenti WHERE id=4; SELECT nome, cognome, AVG(voto) as Media, COUNT(voto) as NumeroVoti FROM Studenti, Materia, Registro WHERE id_materia = Materia.id AND id_studente = Studenti.id GROUP BY nome, cognome
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