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I'm using the following query in PostgreSQL 10 to find dublicate entries:

select
  column1, column2, count(*)
from mytable
  where column3 in ('yes', 'no')
group by column1, column2 having count(*) > 2;

Is it possible to have PostgreSQL delete the dublicates except of course the first of each entry?

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  • Sample data and desired results would be helpful. Commented Jul 2, 2019 at 11:27

1 Answer 1

Reset to default
1

Assuming your table has a primary key:

delete from mytable t
    where t.pk <> (select min(t2.pk)
                   from mytable t2
                   where t2.column1 = t.column1 and
                         t2.column2 = t.column2 and
                         t2.column3 in ('yes', 'no')
                  );
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