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create table e ( id integer primary key, name varchar(255), tel integer ); insert into e values (1, 'a', 1), (2, 'b', 2), (3, 'c', 2), (4, 'd', 5), (5, 'e', 7); select * from e; Delete FROM e e1 using e e2 where e1.id > e2.id AND e1.tel=e2.tel; select * from e;

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