On Sat, Nov 03, 2007 at 11:42:39AM +0400, rihad wrote:
> Does this mean that a condition like "WHERE ... [AND] lhs.a=rhs.b [AND]
> ..." where rhs.b is already unique-indexed, also requires (non-unique)
> index on lhs.a for maximal join speed? Otherwise why would they want to
> say that?
No, as
http://www.postgresql.org/docs/8.2/interactive/indexes-intro.html
states that "Indexes can moreover be used in join searches. Thus, an
index defined on a column that is part of a join condition can
significantly speed up queries with joins."
Does this mean that a condition like "WHERE ... [AND
