Bruno Wolff III wrote:
There should be parenthesis around the list to test.
WHERE a_name, a_type, a_dir NOT IN (
should be
WHERE (a_name, a_type, a_dir) NOT IN (
That did it (I think)!
I believe that the NOT IN query should run comparably to the LEFT JOIN
example supplied by the other person (at
They are all 'not null' and I am trying to do exactly the kind of task
you described. I tried the first example on my DB and got a syntax error:
tle-bu= SELECT a.file_name, a.file_parent_dir, a.file_type FROM
file_info_1 a WHERE NOT EXIST (SELECT NULL FROM file_set_1 b WHERE
The indexes are:
CREATE INDEX file_info_#_display_idx ON file_info_# (file_type,
file_parent_dir, file_name);
CREATE INDEX file_set_#_sync_idx ON file_set_# (fs_name, fs_parent_dir,
fs_type)
Are these not effective for the second query? If not, what should I
change or add? If so, would
Hi all,
Is it possible to count and display the number of children of a parent in a
generic query?
parent table: id
child table: id, parent_id
Example output of the query:
parentidnumber_of_children
parent1 2
parent2 6
parent3 0
Groeten,
Joost Kraaijeveld
I use a bigger psql-table to store information and keep an id-value of
how big ?
each row in memory of my application for faster access.
related to the previous question : are you sure there won't be a day
where it won't fit ?
My applications is able to calculate a list of needed id's in
Maybe you could use arrays as some function parameters ?
Can you explain why you need so many parameters ?
On Sat, 1 Jan 2005 22:25:02 -0700, Michael Fuhr [EMAIL PROTECTED] wrote:
On Sun, Jan 02, 2005 at 01:31:22AM +, Oluwatope Akinniyi wrote:
I tried to create a function with
select field1,field2,field3 from mytable where id=XX;
For instance, on my machine :
SELECT * FROM bigtable with 2M rows WHERE id IN (list of 500 values)
takes 10 ms.
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On Sat, Jan 01, 2005 at 06:35:30PM -0800, Jeff Davis wrote:
On Sun, 2004-12-12 at 20:25 -0800, Lonni J Friedman wrote:
OK, thanks. So is there any real benefit in doing this in a generic
(non-dspam) sense, or is it just a hack that wouldn't be noticable?
Any risks or potential problems
Vincent Hikida wrote:
The indexes are:
CREATE INDEX file_info_#_display_idx ON file_info_# (file_type,
file_parent_dir, file_name);
CREATE INDEX file_set_#_sync_idx ON file_set_# (fs_name,
fs_parent_dir, fs_type)
Are these not effective for the second query? If not, what should I
change
As was anticipated, time between Release Candidate 2 and 3 was nice and
short, with more changes being made now to Documentation vs Code.
A current list of *known* supported platforms can be found at:
http://developer.postgresql.org/supported-platforms.html
We're always looking to
I didn't realize that the order made a difference. A sign of how much
learning I need to do. :p For reference, I think 'file_parent_dir' and
'fs_parent_dir' are the most important because I do an 'ORDER BY
[fs|file]_parent_dir ASC' on most queries. I've made the changes, thank
you
Is there any way, with PG 8 rc 3, to share a sequence across databases -
assuming all databases are on the same machine? Thanks,
Dunc
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begin C. Duncan Hudson [EMAIL PROTECTED] wrote:
Is there any way, with PG 8 rc 3, to share a sequence across databases -
assuming all databases are on the same machine? Thanks,
Possibly via contrib/dblink, also on ealier versions.
I'm not sure about sequences, but with tables this is
BYTEA is not always pragmatic. What is the file is 100 megs? 256 megs?
What is the size when bytea become inafective ?
I don't think it's so much a matter of effectiveness, it makes no
difference at all in storage space.
Ah, thanks, good to know. Something new to learn every day...
The
Useful to add a title to your messages before you post...
How about:
select parentid, count(*) as number_of_children
from childtable
group by parentid
order by parentid;
If there are parent records that have no children then these will be
omitted. The query above totally ignores the parent table
I just downloaded and installed RC3 on my OS X system (10.3.7), and I'm
getting a shared memory error when trying to run initdb (error message
listed below). I received a similar error a few weeks ago after
upgrading my OS to 10.3.7, but I was able to get around that by
reducing the
On Sun, Jan 02, 2005 at 10:44:16AM -0500, C. Duncan Hudson wrote:
Is there any way, with PG 8 rc 3, to share a sequence across databases -
assuming all databases are on the same machine?
As Andreas Kretschmer mentioned, you might be able to use dblink.
Why do you want to share a sequence
Does this release incorporate a change to the bgwriter or was it
determined to leave it as-is until 8.1?
Regards,
Jeff Davis
On Sun, 2005-01-02 at 10:56 -0400, Marc G. Fournier wrote:
As was anticipated, time between Release Candidate 2 and 3 was nice and
short, with more changes
Timothy Perrigo [EMAIL PROTECTED] writes:
I just downloaded and installed RC3 on my OS X system (10.3.7), and I'm
getting a shared memory error when trying to run initdb (error message
listed below). I received a similar error a few weeks ago after
upgrading my OS to 10.3.7, but I was able
Hi John,
John Sidney-Woollett schreef:
Useful to add a title to your messages before you post...
It escaped before finishing.
How about:
select parentid, count(*) as number_of_children
from childtable
group by parentid
order by parentid;
It works but can you tell me why this works?
On Sun, Jan 02, 2005 at 01:31:22AM +, Oluwatope Akinniyi wrote:
Hi,
Compliments of the season.
I tried to create a function with about 60 input parameters and got
an error message that a function cannot take more than 32
parameters.
Generally, a function with that many input
Michael Fuhr wrote:
On Sun, Jan 02, 2005 at 10:44:16AM -0500, C. Duncan Hudson wrote:
Is there any way, with PG 8 rc 3, to share a sequence across databases -
assuming all databases are on the same machine?
As Andreas Kretschmer mentioned, you might be able to use dblink.
Why do you want
On Sun, Jan 02, 2005 at 12:56:52PM -0800, David Fetter wrote:
Other people have made suggestions about recompiling PostgreSQL,
hacking the source code, etc., etc. These are things you should only
attempt when you are absolutely certain that there is no other way to
do what you need to do
You might need to read a good SQL primer to get a full explanation of
this feature.
Reading from the docs,
http://www.postgresql.org/docs/7.4/interactive/sql-select.html
quote
The optional GROUP BY clause has the general form
GROUP BY expression [, ...]
GROUP BY will condense into a single row
On Sun, 2005-01-02 at 16:19 -0500, C. Duncan Hudson wrote:
[about databases sharing a sequence]
I have 3 instances of the application
(each for a different business unit) and I don't want them generating
the same numbers for different things. I want the numbers, across
Hi,
I have a 4 x SCSI in RAID 10 (PG 7.4.6) with a regular performance.
My database have 55 Gb of data.
In PG 8, moving the indexes to a separeted disk (or array) can
(generally) improve the performance if the system make a heavy use of
indexes ?
Thanks
Alexandre
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On Jan 2, 2005, at 12:58 PM, Tom Lane wrote:
Timothy Perrigo [EMAIL PROTECTED] writes:
I just downloaded and installed RC3 on my OS X system (10.3.7), and
I'm
getting a shared memory error when trying to run initdb (error message
listed below). I received a similar error a few weeks ago after
Timothy Perrigo [EMAIL PROTECTED] writes:
On Jan 2, 2005, at 12:58 PM, Tom Lane wrote:
I think you probably are trying to run two postmasters at once. You
really need to increase the OS X memory limits, instead.
No, I just ran pg_ctl status to check, and here was the output:
pg_ctl: neither
Hi all,
After all the great help I got from you all I managed to finish what
I was struggling with. The last thing I need to do should be pretty
simple. :)
I use this query to return values from one table that don't exits in
another table:
SELECT a.fs_name, a.fs_parent_dir, a.fs_type FROM
Hi,
The function CHAR in db2 returns a fixed length character string
representation of an integer number.What is the corresponding function in
Postgres?
Regards,
Vinita Bansal
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