Laurent Martelli <laurent@aopsys.com> writes:
> PFC> SELECT owner from pictures group by owner;
>
> That's a slight improvement, but there's still a seq scan on pictures:
It should be a sequential scan. An index will be slower.
> HashAggregate (cost=114.38..114.38 rows=21 width=4) (actual time=7.585..7.605 rows=21 loops=1)
> -> Seq Scan on pictures (cost=0.00..103.70 rows=4270 width=4) (actual time=0.015..3.272 rows=4270 loops=1)
> Total runtime: 7.719 ms
That's the best plan for this query.
--
greg