Bruno Wolff III wrote:
>>Not according to the optimizer! Plus, this is not guaranteed to return
>>the correct results.
>
> For it to be fast you need an index on (stock_id, price_date) so that
> you can use an index scan.
I already said that such an index existed. In fact, it is the primary
key of the table. And yes, I *am* analyzed!
> The answers are guarenteed to be correct. See:
> http://developer.postgresql.org/docs/postgres/sql-select.html#SQL-DISTINCT
That's good to know. Thanks!
Ken