Hello again,
Actually I'm using PostgreSQL 8.2.4
By the way, I tried reindexing the tables but the problem remains
REINDEX TABLE sip_carriere_dates;
REINDEX TABLE sip_carriere;
I also made a pg_dump of the database and then restored it in a test one,
the queries run perfectly well but it gives an error when I add the
condition with the operator is null, for example:
dragon_test=# select distinct c.emp_id, c.institution, d.* from sip_carriere
c left join sip_demissionaire d on d.emp_id = c.emp_id where c.emp_id = 2700
;
emp_id | institution | emp_id | demission_date
+-++
2700 | 11 ||
2700 | 52 ||
(2 rows)
dragon_test=# select distinct c.emp_id, c.institution, d.* from sip_carriere
c left join sip_demissionaire d on d.emp_id = c.emp_id where c.emp_id = 2700
and d.emp_id is null;
emp_id | institution | emp_id | demission_date
+-++
(0 rows)
Also, when I run the following command to vacuum all the databases :
/usr/local/pgsql/bin/vacuumdb -a -f -z -v -U pascal
All the queries become busted again
Weird, isn't it !
I'd appreciate any help
Pascal
-Original Message-
From: Richard Huxton [mailto:[EMAIL PROTECTED]
Sent: Wednesday, December 10, 2008 7:45 PM
To: [EMAIL PROTECTED]
Cc: [email protected]
Subject: Re: [SQL] Is there a bug in PostgreSQL ?
Pascal Tufenkji wrote:
>
> SELECT distinct c.emp_id,c.institution,d.* from sip_carriere c left join
> sip_demissionaire d on d.emp_id = c.emp_id where c.emp_id = 342 ;
[snip - rows]
>
> SELECT distinct c.emp_id,c.institution,d.* from sip_carriere c left join
> sip_demissionaire d on d.emp_id = c.emp_id where c.institution = 1;
[snip - rows]
>
> BUT IF I PUT BOTH CONDITIONS
>
>
>
> SELECT distinct c.emp_id,c.institution,d.* from sip_carriere c left join
> sip_demissionaire d on d.emp_id = c.emp_id where c.emp_id = 342 and
> c.institution = 1;
[snip - no rows]
> What's the problem ?
>
> I'm sure that the problem is with the view "sip_demissionaire" cause when
I
> copied its content to a temp table, the query returned a result.
> SELECT * into temp foo from sip_demissionaire ;
>
> SELECT distinct c.emp_id,c.institution,d.* from sip_carriere c left join
foo
> d on d.emp_id = c.emp_id where c.emp_id = 342 and c.institution = 1;
Good testing. It looks to me like you have a corrupted index. If you run
EXPLAIN ANALYSE SELECT ... for each of your queries, you'll probably see
that the one that returns no rows is using a particular index that the
other queries aren't.
Have you had any crashes / power failures / disk errors recently?
Oh - and what version of PostgreSQL is this?
--
Richard Huxton
Archonet Ltd
