-- create table CREATE TABLE studente ( id INTEGER PRIMARY KEY, nome TEXT NOT NULL, sesso TEXT NOT NULL ); CREATE TABLE classe ( id INTEGER PRIMARY KEY, nome TEXT NOT NULL ); CREATE TABLE materia ( id INTEGER PRIMARY KEY, nome TEXT NOT NULL ); CREATE TABLE lezione ( id INTEGER PRIMARY KEY, id_studente INTEGER NOT NULL, id_materia INTEGER NOT NULL, id_classe INTEGER NOT NULL, data DATE ); -- insert value INSERT INTO studente VALUES (1, 'Ryan', 'M'); INSERT INTO studente VALUES (2, 'Joanna', 'F'); INSERT INTO studente VALUES (3, 'Robert', 'M'); INSERT INTO classe VALUES (1, '1A'); INSERT INTO classe VALUES (2, '1B'); INSERT INTO materia VALUES (1, 'Italiano'); INSERT INTO materia VALUES (2, 'Inglese'); INSERT INTO lezione VALUES (1, 1, 1, 1, '2023-04-01'); INSERT INTO lezione VALUES (2, 3, 1, 1, '2023-04-01'); INSERT INTO lezione VALUES (3, 2, 2, 2, '2023-04-01'); INSERT INTO lezione VALUES (4, 1, 1, 1, '2023-04-02'); INSERT INTO lezione VALUES (5, 3, 2, 2, '2023-04-02'); INSERT INTO lezione VALUES (6, 2, 2, 2, '2023-04-02'); -- fetch some values
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