On Wed, Jan 1, 2014 at 4:14 AM, Janek Sendrowski <janek12(at)web(dot)de> wrote:
> I want to delete duplicates in my table. I've dropped the unique
> constraint to insert my data.
> My id value is a hash calculated witch the values of the two other columns.
> So I want to delete all columns, which are indentical, but keeping one.
>
> DELETE FROM table t1 USING table t2 WHERE t1.id = t2.id AND t1.ctid >
> t2.ctid
>
> But the oids aren't unique enough.
> What else could I do?
http://postgres.cz/wiki/PostgreSQL_SQL_Tricks#Delete_duplicate_rows_with_window_analytic_functions
http://wiki.postgresql.org/wiki/Deleting_duplicates