On Wed, Jan 1, 2014 at 4:14 AM, Janek Sendrowski <jane...@web.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
