This is great, we thought we may go for code changes, we will go with this
solution instead.
Thanks
Yuva
-----Original Message-----
From: Stephan Szabo [mailto:sszabo@megazone23.bigpanda.com]
Sent: Tuesday, July 30, 2002 9:31 PM
To: Yuva Chandolu
Cc: 'pgsql-hackers@postgresql.org'
Subject: Re: [HACKERS] Outer join differences
On Tue, 30 Jul 2002, Yuva Chandolu wrote:
> Hi,
>
> I see different results in Oracle and postgres for same outer join
queries.
> Here are the details.
Those probably aren't the same outer join queries.
> When I run the query "select yt1_name, yt1_descr, yt2_name, yt2_descr from
> yuva_test1 left outer join yuva_test2 on yt1_id=yt2_id and yt2_name =
> '2-name2'" on postgres database I get the following results
>
Both conditions are part of the join condition for the outer join.
> But when I tried the same on Oracle(8.1.7) (the query is "select yt1_name,
> yt1_descr, yt2_name, yt2_descr from yuva_test1, yuva_test2 where
> yt1_id=yt2_id(+) and yt2_name = '2-name2'') I get the following result
One condition is the join condition and one is a general where condition I
would guess since only one has the (+)
I think the equivalent query is
select yt1_name, yt1_descr, yt2_name, yt2_descr from yuva_test1 left outer
join yuva_test2 on yt1_id=yt2_id where yt2_name='2-name2'.
Note of course that you're destroying the outer joinness by doing
that yt2_name='2-name2' since the rows with no matching yuva_test2
will not match that conditoin.
