> In a table I entered by accident two times the same record, if I now
> list the table I see two lines with exactly the same contents. How can
> I delete one of those two records? I can't find a select criterium which
> differs for both.
>
create table t (a int, b text);
insert into t values (1, 'a');
insert into t values (1, 'a');
insert into t values (1, 'a');
insert into t values (1, 'a');
select oid, * from t;
