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create table t ( id serial, a int ); insert into t(a) values (1),(1),(2),(2),(1),(1),(2),(3),(2),(4),(3); select * from t; select * from t left join t t1 on t.a = t1.a and t.id > t1.id; delete t.* from t left join t t1 on t.a = t1.a and t.id > t1.id where t1.id is not null; select * from t;
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