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python
3 years ago
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import sqlite3 def create_tables(): conn = sqlite3.connect('practice6.db') cursor = conn.cursor() _SQL_1 = """CREATE TABLE IF NOT EXISTS teacher( teacher_id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR(255), surname VARCHAR(255), sex VARCHAR(255), subject VARCHAR(255) )""" _SQL_2 = """CREATE TABLE IF NOT EXISTS pupil( pupil_id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR(255), surname VARCHAR(255), sex VARCHAR(255), class INTEGER )""" _SQL_3 = """CREATE TABLE IF NOT EXISTS teacher_pupil( teacher_id INTEGER, pupil_id INTEGER, FOREIGN KEY (teacher_id) REFERENCES teacher(teacher_id), FOREIGN KEY (pupil_id) REFERENCES pupil(pupil_id) )""" for i in [_SQL_1, _SQL_2, _SQL_3]: cursor.execute(i) conn.commit() cursor.close() conn.close() def get_giorgi_teachers(): conn = sqlite3.connect('practice6.db') cursor = conn.cursor() _SQL = """ SELECT t.name FROM pupil p JOIN teacher_pupil tp ON (p.pupil_id = tp.pupil_id) JOIN teacher t ON (tp.teacher_id = t.teacher_id) WHERE p.name = 'giorgi'; """ result = cursor.execute(_SQL) data = result.fetchall() cursor.close() conn.close() return data # create_tables() print(get_giorgi_teachers())
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