Почему не заносятся данные в таблицу?

Вроде таблица создаётся, но данных нету, вот мой код:
mycursor.execute('''Create table Publisher
(Publisher_Name VARCHAR(100) Primary Key NOT NULL,
Publisher_Address VARCHAR(200) NOT NULL,
Publisher_Phone VARCHAR(50) NOT NULL)''')


mycursor.execute('''INSERT INTO Publisher (Publisher_Name, Publisher_Address, Publisher_Phone)
VALUES ('DAW Books','375 Hudson Street, New York, NY 10014','212-366-2000'),
('Viking','375 Hudson Street, New York, NY 10014','212-366-2000'),
('Signet Books','375 Hudson Street, New York, NY 10014','212-366-2000'),
('Chilton Books','Not Available','Not Available'),
('George Allen & Unwin','83 Alexander Ln, Crows Nest NSW 2065, Australia','+61-2-8425-0100'),
('Alfred A. Knopf','The Knopf Doubleday Group Domestic Rights, 1745 Broadway, New York, NY 10019','212-940-7390'),
('Bloomsbury','Bloomsbury Publishing Inc., 1385 Broadway, 5th Floor, New York, NY 10018','212-419-5300'),
('Shinchosa','Oga Bldg. 8, 2-5-4 Sarugaku-cho, Chiyoda-ku, Tokyo 101-0064 Japan','+81-3-5577-6507'),
('Harper and Row','HarperCollins Publishers, 195 Broadway, New York, NY 10007','212-207-7000'),
('Pan Books','175 Fifth Avenue, New York, NY 10010','646-307-5745'),
('Chalto & Windus','375 Hudson Street, New York, NY 10014','212-366-2000'),
('Harcourt Brace Jovanovich','3 Park Ave, New York, NY 10016','212-420-5800'),
('W.W. Norton',' W. W. Norton & Company, Inc., 500 Fifth Avenue, New York, New York 10110','212-354-5500'),
('Scholastic','557 Broadway, New York, NY 10012','800-724-6527'),
('Bantam','375 Hudson Street, New York, NY 10014','212-366-2000'),
('Picador USA','175 Fifth Avenue, New York, NY 10010','646-307-5745')''')