On Sun, 11 Sep 2005, Mark Dilger wrote:
> All,
>
> In the psql output below, I would expect the second query to run faster,
> because the b-tree index on two columns knows the values of 'b' for any
> given value of 'a', and hence does not need to fetch a row from the
> actual table. I am not seei
All,
In the psql output below, I would expect the second query to run faster, because
the b-tree index on two columns knows the values of 'b' for any given value of
'a', and hence does not need to fetch a row from the actual table. I am not
seeing a speed-up, however, so I expect my understan
