One point I might not have made clear. The reason I want to remove duplicates
is that the column "data_object.unique_id" became non-unique (someone added
duplicate rows). So I added the bigSeriel (idx) to uniquely identify the
rows, and I was using the SELECT MIN(idx) and GroupBy to pick just one of
the rows that became duplicated.
I am going to try out some of your excellent suggestions. I will report back
on how they are working.
One idea that was given to me was the following (what do you think Merlin?)
CREATE TABLE portal.new_metatdata AS
select distinct on (data_object.unique_id) * FROM portal.metadata;
Or something of this ilk should be faster because it only need to do a
sort on data_object.unique_id and then an insert. After you have
verified the results you can do:
ALTER TABLE portal.metatdata rename TO portal.new_metatdata_old;
ALTER TABLE portal.new_metatdata rename TO portal.metatdata_old;
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