如何删除数据库中的冗余数据（翻译）

如何删除数据库中的冗余数据（翻译） (2) INSERT INTO Customers
   VALUES (1000, 'Bradley', 'Tom', '2450 3rd Str. #12',
           'San Francisco', 'CA', '94114', '4156679230',
           TO_DATE('01-JAN-2000', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1001, 'Stone', 'Tony', '12 Main St. Apt. 3',
           'Oakland', 'CA', '94342', '5104562881',
           TO_DATE('12-MAR-2001', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1002, 'Chang', 'Jim', '425 26th Ave.',
           'Seattle', 'WA', '98103', '8182454400',
           TO_DATE('15-JUN-2000', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1003, 'Loney', 'Julie', '12 Keith St.',
           'Castro Valley', 'CA', '94546', '5103300721',
           TO_DATE('22-NOV-2000', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1004, 'King', 'ChUCk', '100 Broadway St.',
           'Pleasant Hill', 'CA', '95114', '9254247701',
           TO_DATE('14-APR-2001', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1005, 'Krieger', 'Jeff', '120 Mercury Rd.',
           'San Ramon', 'CA', '95114', '9252997100',
           TO_DATE('02-FEB-2001', 'DD-MON-YYYY'));

INSERT INTO Customers