Le 29/10/2010 14:46, Guillaume Lelarge a écrit :
Le 29/10/2010 13:52, Rob Richardson a écrit :
A customer was reviewing the database that supports the application we
have provided. One of the tables is very simple, but has over 16
million records. Here is the table's definition:
CREATE
Hello Postgres users,
to mimic the MySQL-REPLACE statement I need
to try to UPDATE a record and if that fails - INSERT it.
But how can I detect that the UPDATE has failed in my SQL procedure?
begin transaction;
create table pref_users (
id varchar(32) primary
Hello
2010/10/31 Alexander Farber alexander.far...@gmail.com:
Hello Postgres users,
to mimic the MySQL-REPLACE statement I need
to try to UPDATE a record and if that fails - INSERT it.
But how can I detect that the UPDATE has failed in my SQL procedure?
see:
I using Postgresql 8.1 and during vacuum at night time, I am getting the
following log:
number of page slots needed (2520048) exceeds max_fsm_pages (356656)
Do I need to increase max_fsm_pages to 2520048? Does it have any bad affect?
Hello
2010/10/31 AI Rumman rumman...@gmail.com:
I using Postgresql 8.1 and during vacuum at night time, I am getting the
following log:
number of page slots needed (2520048) exceeds max_fsm_pages (356656)
Do I need to increase max_fsm_pages to 2520048? Does it have any bad affect?
I takes a
Thanks Pavel, but I have an SQL procedure and not plpgsql?
On Sun, Oct 31, 2010 at 9:34 AM, Pavel Stehule pavel.steh...@gmail.com wrote:
But how can I detect that the UPDATE has failed in my SQL procedure?
see:
http://www.postgresql.org/docs/8.4/interactive/plpgsql-control-structures.html
Hey Alexander, Pavel
The solution like below should works IMO, but it does not.
insert into pref_users(id, first_name, last_name,
female, avatar, city, last_ip)
select $1, $2, $3, $4, $5, $6, $7
where not exists
(update pref_users set first_name = $2,
Hello
2010/10/31 Dmitriy Igrishin dmit...@gmail.com:
Hey Alexander, Pavel
The solution like below should works IMO, but it does not.
insert into pref_users(id, first_name, last_name,
female, avatar, city, last_ip)
select $1, $2, $3, $4, $5, $6, $7
where not exists
Okay, Pavel, will wait for 9.1 :-)
It is a common case - insert new row if it cannot be updated.
2010/10/31 Pavel Stehule pavel.steh...@gmail.com
Hello
2010/10/31 Dmitriy Igrishin dmit...@gmail.com:
Hey Alexander, Pavel
The solution like below should works IMO, but it does not.
2010/10/31 Dmitriy Igrishin dmit...@gmail.com:
Okay, Pavel, will wait for 9.1 :-)
It is a common case - insert new row if it cannot be updated.
you can find (probably) MERGE statement in 9.1.
Pavel
2010/10/31 Pavel Stehule pavel.steh...@gmail.com
Hello
2010/10/31 Dmitriy Igrishin
Alexander Farber wrote on 31.10.2010 09:22:
Hello Postgres users,
to mimic the MySQL-REPLACE statement I need
to try to UPDATE a record and if that fails - INSERT it.
There is actually an example of this in the PG manual ;)
Thanks for all the comments.
Do I need to use BEGIN/COMMIT in my plpgsql-function for UPSERT or are
functions atomic?
Regards
Alex
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And would a pure SQL-function solution to call
an INSERT followed by an UPDATE in its body
and ignoring the error? (don't know how ignore it
best though, so that I don't ignore other critical errors)
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To make changes to your
[corrected typo, sorry]
And wouldn't a pure SQL-function solution be:
to call an INSERT followed by an UPDATE in its body
and ignoring the error? (don't know how ignore that error
best though, so that I don't ignore other critical errors)
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2010/10/31 Alexander Farber alexander.far...@gmail.com:
Thanks for all the comments.
Do I need to use BEGIN/COMMIT in my plpgsql-function for UPSERT or are
functions atomic?
If you use a code from documentation, then you don't need explicit
transaction - every SQL run inside outer implicit
2010/10/31 Alexander Farber alexander.far...@gmail.com:
And would a pure SQL-function solution to call
an INSERT followed by an UPDATE in its body
and ignoring the error? (don't know how ignore it
best though, so that I don't ignore other critical errors)
You must not ignore errors in SQL -
On 10/30/2010 4:48 PM, Viktor Bojović wrote:
Hi,
i have very big XML documment which is larger than 50GB and want to
import it into databse, and transform it to relational schema.
When splitting this documment to smaller independent xml documments i
get ~11.1mil XML documents.
I have spent lots
Please, help me.
Why the condition
SELECT 5 NOT IN (NULL)
returns NULL, but not FALSE (as I thought)?
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Paul
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Paul maga...@mail.ru writes:
Why the condition
SELECT 5 NOT IN (NULL)
returns NULL, but not FALSE (as I thought)?
Because the SQL standard says so.
If you think of NULL as meaning unknown, it makes some intuitive
sense: it's unknown whether that unknown value is equal to 5.
On 31/10/2010 16:37, Paul wrote:
Please, help me.
Why the condition
SELECT 5 NOT IN (NULL)
returns NULL, but not FALSE (as I thought)?
Because NULL basically means don't know - so you don't know whether 5
is there or not.
Ray.
--
Raymond O'Donnell :: Galway :: Ireland
r...@iol.ie
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Sent
Tom,
Sunday, October 31, 2010, 9:42:27 PM, you wrote:
TL Because the SQL standard says so.
But there is not such thing in PostgreSQL as empty set as IN () that
must be
false, because nothing element may be found in empty set.
And I thought that instead of IN () I could use IN (NULL),
2010/10/31 Paul maga...@mail.ru:
Tom,
Sunday, October 31, 2010, 9:42:27 PM, you wrote:
TL Because the SQL standard says so.
But there is not such thing in PostgreSQL as empty set as IN () that
must be
false, because nothing element may be found in empty set.
And I thought that
Paul maga...@mail.ru writes:
But there is not such thing in PostgreSQL as empty set as IN () that
must be
false, because nothing element may be found in empty set.
And I thought that instead of IN () I could use IN (NULL), but I
was failed and result was NULL and not FALSE. :(
NULL
I've created a function now (below) and can call it as well,
but how can I see it at the psql prompt? Is there a \d command
for that or should I dump the database to see my declarations?
And is my function atomic? I.e. can't it happen, that FOUND
is not true, but then another session calls a
\df *update*
Alexander Farber wrote:
I've created a function now (below) and can call it as well,
but how can I see it at the psql prompt? Is there a \d command
for that or should I dump the database to see my declarations?
And is my function atomic? I.e. can't it happen, that FOUND
is not
On 31/10/2010 17:28, Alexander Farber wrote:
I've created a function now (below) and can call it as well,
but how can I see it at the psql prompt? Is there a \d command
for that or should I dump the database to see my declarations?
You can do \df public.*, assuming that your function is in the
On Sun, Oct 31, 2010 at 2:43 AM, AI Rumman rumman...@gmail.com wrote:
I using Postgresql 8.1 and during vacuum at night time, I am getting the
following log:
number of page slots needed (2520048) exceeds max_fsm_pages (356656)
Do I need to increase max_fsm_pages to 2520048? Does it have any
This post is just to record an example of how to use the new window fn's in 8.4
to perform difference-between-row calculations.
To demonstrate, we create a table with 30 rows of data, two columns, one of
which contains the sequence 1..30, the other contains mod(c1,10).
So the table looks like
Hello,
I have a card game for each I'd like to introduce weekly tournaments.
I'm going to save the score (virtual money) won by each player into:
create table pref_money (
id varchar(32) references pref_users,
yw char(7) default to_char(current_timestamp,
Use the Postgres window functions like rank(); this is what they're for.
http://www.postgresql.org/docs/8.4/interactive/queries-table-expressions.html#QUERIES-WINDOW
-- Darren Duncan
Alexander Farber wrote:
Hello,
I have a card game for each I'd like to introduce weekly tournaments.
I'm
I tried
SELECT (SHOW server_version) AS Contents
but got
ERROR: syntax error at or near server_version at character 14
how to get server version inside select statement ?
Andrus.
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2010/10/31 Andrus kobrule...@hot.ee:
I tried
SELECT (SHOW server_version) AS Contents
but got
ERROR: syntax error at or near server_version at character 14
how to get server version inside select statement ?
SELECT current_setting('server_version') AS Contents;
Osvaldo
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Hi,
I have two tables (A and B), which are partitioned (A1, A2... B1, B2...) for
easy deletion of old records. They are linked by a bigint column id, which
is defined as a foreign key in each B partition referencing the
corresponding A partition. Many rows in B1 can reference a single row in A1.
On 31 Oct 2010, at 22:56, Andrus wrote:
I tried
SELECT (SHOW server_version) AS Contents
postgres= select version();
version
Thanks. That's work pretty well.
--- On Tue, 10/26/10, Alban Hertroys dal...@solfertje.student.utwente.nl
wrote:
From: Alban Hertroys dal...@solfertje.student.utwente.nl
Subject: Re: [GENERAL] Slow connection once the PC is network connected
To: Yan Cheng CHEOK ycch...@yahoo.com
Cc:
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