Laurent Martelli <[EMAIL PROTECTED]> 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.


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