Hi all
i dont know if this is normal, but if yes i would like to know why and
how I could do it another way other than using unions.
(I tried on postgresql 7.4 and 8.0.3, made my vacuum analyse just before)
Here is my simple query:
select *
from rt_node n, rt_edge e
where node_id = 2
and
Jocelyn Turcotte wrote:
Hi all
i dont know if this is normal, but if yes i would like to know why and
how I could do it another way other than using unions.
The only thing that *might* work is if you used an index on both keys.
So if you did:
CREATE INDEX rt_edge_start_end_node ON
Thanks John
it dont seems to work, but in my context I only needed data from the
rt_node table so I tried this:
select *
from rt_node n
where node_id = 2
and exists (select edge_id from rt_edge where start_node_id =
n.node_id or end_node_id = n.node_id)
and it gave me this plan (even if I
Jocelyn Turcotte [EMAIL PROTECTED] writes:
But if I plug another condition with a OR like this:
select *
from rt_node n, rt_edge e
where node_id = 2
and (e.start_node_id = n.node_id or e.end_node_id = n.node_id);
I get this plan, it stop using the index!:
I'm afraid you're stuck with
