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create table t ( id int primary key, v int ); insert into t(id, v) values (1, 1),(2, 1),(3, 2),(4, 2),(5, 1),(6, 1),(7, 2),(8, 3),(9, 2),(10, 4),(11, 3); select * from t; select * from t left join t t1 on t.v = t1.v and t.id > t1.id; delete t.* from t left join t t1 on t.v = t1.v and t.id > t1.id where t1.id is not null; select * from t;

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