I am having a problem with left joins in Postgresql.(probably my
misunderstanding of left joins)
My first Query returns
70,000
select count(*)
from h
where h.tn 20
and h.tn 30
my left join
returns only 34,000
select count(*)
from h left join p using (r,pos)
where h.tn 20
and h.tn 30
Grant Morgan wrote:
I am having a problem with left joins in Postgresql.(probably my
misunderstanding of left joins)
My first Query returns
70,000
select count(*)
from h
where h.tn 20
and h.tn 30
my left join
returns only 34,000
select count(*)
from h left join p using (r,pos)
where
Thank you Richard and Nick, your right.
And what Nick showed below is what I wanted.
Cheers,
Grant
On Wed, 06 Jul 2005 19:33:03 +0900, Nick Stone [EMAIL PROTECTED] wrote:
I've had exactly yhe same problem - try changing the query to.
select count(*)
from h left join p using (r,pos) and
I've had exactly yhe same problem - try changing the query to.
select count(*)
from h left join p using (r,pos) and p.r_order=1
where h.tn 20
and h.tn 30
I think that should do it - the syntax you used would work in Oracle and MS
SQL but there's a subtle difference with the way Postgres
Grant Morgan [EMAIL PROTECTED] writes:
select count(*)
from h left join p using (r,pos)
where h.tn 20
and h.tn 30
and p.r_order=1
since it is a left join I though I should get a number no smaller in
the left join than the original unjoined query. It seems to be acting
like an inner
Hi,
i'm wondering if there is a way to prepare and execute a plan in a
plpgsql function.
The prepare seems to work as expected but obviously the execute
plan_name(...) statement is interpreted as the plpgsql execute keyword
and says me that the plan_name function don't exists
is there a way to
Jocelyn Turcotte [EMAIL PROTECTED] writes:
i'm wondering if there is a way to prepare and execute a plan in a
plpgsql function.
You do not need that because plpgsql automatically caches plans for
SQL statements appearing in a plpgsql function.
regards, tom lane
