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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); /*DELETE FROM t WHERE id NOT IN(*/ SELECT MIN(id), v from t GROUP BY v; SELECT id, v FROM t;

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