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CREATE TABLE contacts ( id INT, email varchar(100) ); INSERT INTO contacts (id,email) VALUES (1,'aaa@aaa.com'); INSERT INTO contacts (id,email) VALUES (2,'bbb@aaa.com'); INSERT INTO contacts (id,email) VALUES (3,'cc@aaa.com'); INSERT INTO contacts (id,email) VALUES (4,'bbb@aaa.com'); INSERT INTO contacts (id,email) VALUES (5,'aaa@aaa.com'); INSERT INTO contacts (id,email) VALUES (6,'ddd@aaa.com'); INSERT INTO contacts (id,email) VALUES (7,'aaa@aaa.com'); INSERT INTO contacts (id,email) VALUES (8,'ccc@aaa.com'); INSERT INTO contacts (id,email) VALUES (9,'aaa@aaa.com'); INSERT INTO contacts (id,email) VALUES (10,'bbb@aaa.com'); DELETE e1 FROM contacts e1, contacts e2 WHERE e1.id < e2.id AND e1.email = e2.email; SELECT * FROM contacts;