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） (4)            TO_DATE('15-JUN-1999', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1013, 'Blue', 'Don', '12250 Saturn Rd.',
           'Pleasanton', 'CA', '95434', '9252332400',
           TO_DATE('09-SEP-1999', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1014, 'Stone', 'Tony', '12 Main St. Apt. 3',
           'Oakland', 'CA', '94342', '5104562881',
           TO_DATE('11-APR-2000', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1015, 'Mason', 'Paul', '53 Orange Way',
           'Las Vegas', 'NV', '89101', '5104562881',
           TO_DATE('04-JUL-2000', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1016, 'Stone', 'Tony', '12 Main St. Apt. 3',
           'Oakland', 'CA', '94342', '5104562881',
           TO_DATE('30-DEC-2000', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1017, 'Krieger', 'Jeff', '120 Mercury Rd.',
           'San Ramon', 'CA', '95114', '9252997100',
           TO_DATE('11-JAN-2001', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1018, 'Blake', 'Becky', '1099 Venus St.',
           'Salt Lake City', 'UT', '84106', '8016543501',
           TO_DATE('12-JUN-2001', 'DD-MON-YYYY'));

INSERT INTO Customers
   VALUES (1019, 'Stone', 'Tony', '12 Main St. Apt. 3',