I'm trying to remove duplicate records from a table. The best way I could
think of was to select into a new table using DISTINCT.
I issued the following command:
select distinct on (symbol, date) * into price from pricebackup;
It did indeed remove several rows that had duplicate items. I then tried
to build a unique index on the columns (symbol, date) in pricebackup with:
create unique index price_symbol_date on pricebackup (symbol, date);
and got the error:
ERROR: could not create unique index
DETAIL: Table contains duplicated values.
How is it possible that I could have duplicate values in that table when I
just selected them into the table as distinct? What am I missing?
Any help is appreciated.
Thanks,
Gerry
