Unique indexes can be partial, i.e. defined with a where clause (that must
be included in a query so that PostgreSQL knows to use that index) whereas
unique constraints cannot.
JORGE MALDONADO wrote
I have search for information about the difference between unique index
and unique constraint in
need to add a
global flag:
regexp_replace(column_name,'\W','','g')
See examples under
http://www.postgresql.org/docs/9.1/static/functions-matching.html#FUNCTIONS-POSIX-REGEXP
Cheers,
Steve
On 01/07/2013 11:44 AM, Emi Lu wrote:
Is there a function to split a string to different rows?...
Have you looked at regexp_split_to_table?
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to a newer version (anything past 8.3? 8.4) you can use the
new upgrade tools moving forward to minimize downtime during the upgrade
process but you will *always* need to test and evaluate before deploying.
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4
6
8
10
12
14
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allnumbers not in (select anumber from fooo);
They all give you the same result. The right choice will depend on the
size of your table, how it is indexed, how fully it is populated and
even on your version of PostgreSQL. (Apologies for the funky field/table
naming.)
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On 03/27/2012 07:48 AM, Rehan Saleem wrote:
well i am quite sure its PostgreSQL forum and it is obvious, i am
asking this to concatenate in plpgsql.
*From:* Steve Crawford scrawf...@pinpointresearch.com
*To:* pgsql-sql
=' + 5
exec(sqi)
where 5 is the userid from table1
thanks
Cheers,
Steve
that need a longer timeout you can change just for those
statements.
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that
exists due to SQL requirements but which is a somewhat nonsensical type,
the use of which is not recommended):
http://www.postgresql.org/docs/9.1/static/datatype-datetime.html#DATATYPE-TIMEZONES
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and includes the
@ sign in the expression to avoid accidentally matching something like
...@theholyghost.org.
You can always do a select of the emp_email alongside the replacement
expression to be sure it will do what you want before actually updating
your database.
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goodness.
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?
Try updating the values in both tables within a transaction with
constraints set to deferred:
http://www.postgresql.org/docs/current/static/sql-set-constraints.html
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, but suspect that your first step should be
to check pg_config to see if the server from which you are attempting to
recover data was compiled with --enable-integer-datetimes.
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my questions are: 1) How do we cause the paymentcalc function to be
executed only once? and 2) How do we call a table returning function
with inputs from a table?
Thank you very much!
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suffice for most cases.
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/9.0/static/rowtypes.html on composite
data types and scroll to section 8.15.3.
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%';
count
---
98
(1 row)
Shouldn't it be 99? That is out of 100 records there is one that has
text in column col so the !~~* should return 99 rows. ??
-wes
select count(*) from table where col is null;
(null is neither equal nor not-equal to anything, even null)
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be a more elegant way.
Is there ?
regards
Look at regexp_replace()
http://www.postgresql.org/docs/9.0/static/functions-string.html
http://www.postgresql.org/docs/9.0/static/functions-matching.html#FUNCTIONS-POSIX-REGEXP
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On 05/14/2011 07:36 PM, Jasen Betts wrote:
use the NOT IN operator with a subquery to retch the disallowed
values
Hmmm, retch as a synonym for output? I've seen more than one case
where that is an appropriate description. :)
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are using 8.4) a couple times.
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zones:
steve= select '2011-03-22 14:17:00 Europe/Berlin' at time zone 'UTC';
timezone
-
2011-03-22 13:17:00
(1 row)
steve= select '2011-04-22 14:17:00 Europe/Berlin' at time zone 'UTC';
timezone
-
2011-04-22 12:17:00
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for grouping as well as display.
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Original-Nachricht
Datum: Sun, 12 Sep 2010 01:52:04 +0400
Von: Dmitriy Igrishin dmit...@gmail.com
An: Steve stev...@gmx.net
CC: pgsql-sql@postgresql.org
Betreff: Re: [SQL] Question about PQexecParams
Hey Steve,
2010/9/11 Steve stev...@gmx.net
Hello list
Original-Nachricht
Datum: Sat, 11 Sep 2010 11:08:00 -0400
Von: Lew no...@lewscanon.com
An: pgsql-sql@postgresql.org
Betreff: Re: [SQL] Question regarding indices
On 09/11/2010 08:29 AM, Steve wrote:
I have a small question about the order of values in a query.
Assume I
the
SQL query with ordered data influence the speed of the query?
// Steve
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with this?
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Original-Nachricht
Datum: Sat, 11 Sep 2010 10:05:18 -0400
Von: Michael Gould mgo...@intermodalsoftwaresolutions.net
An: Steve stev...@gmx.net
Betreff: Re: [SQL] Question regarding indices
Steve,
Hello Michael,
If I remember correctly the sort only works
Original-Nachricht
Datum: Sat, 11 Sep 2010 11:04:16 -0400
Von: Tom Lane t...@sss.pgh.pa.us
An: Steve stev...@gmx.net
CC: pgsql-sql@postgresql.org
Betreff: Re: [SQL] Question regarding indices
Steve stev...@gmx.net writes:
I have a small question about the order
something wrong there.
I saw very bad clock performance on one Linux box I had (dual-single core
AMD cpus, no VMs), even with NTP, until I changed the clocksource kernel
parameter to hpet. Unfortunately (or fortunately) I no longer have that box.
--
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The gods
I'm working on a web app for a quality control checklist. I already
have a table set up, but I have a hunch that our model is sub-optimal
and I could get some better performance.I'm hoping someone on this
list can help me think clearly about how to express this efficiently
in SQL.
Each checklist
suited to flagging aggregates for suppression.
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the integer part of the number, which math function can do this for me?
For example, I have 3.900 and I need only the 3 (the integer part), which math
function to be used?
floor(3.900)
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')::date and
date_trunc('month', date_to) = (int1::text || '-' || int2::text ||
'-1')::date
...
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. The latest status report will only need a simple
join on the current table with a max size of 100,000 rather than a
more complex query over a 100,000,000 record table.
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...
canon=# select count(maf) from gallo.sds_seq_reg_shw
canon-# where maf ISNULL;
count
---
0
(1 row)
I believe count will only count not-null anyway so this will always
return zero. Try count(*) instead of count(maf). Here's an example:
st...@[local]= select * from
Date: Wed, 15 Apr 2009 21:23:04 -0700
From: Steve Midgley scie...@misuse.org
To: Erik Jones ejo...@engineyard.com
Subject: Re: How to count from a second table in an aggregate query?
Message-ID: 49e6b2a8.5040...@misuse.org
Erik Jones wrote:
On Apr 15, 2009, at 1:15 PM, Steve Midgley wrote
id's
in a single result set
Thanks for any assistance on this!
Steve
/*SQL STARTS*/
drop table if exists contact_log;
drop table if exists contact_property;
create table contact_log(id serial NOT null, src_contact_id integer,
log_type character varying(63), CONSTRAINT contact_log_pkey PRIMARY KEY
Erik Jones wrote:
On Apr 15, 2009, at 1:15 PM, Steve Midgley wrote:
I want to generate an analysis report that counts the values in two
separate tables. I've been able to accomplish what I want with two
separate queries that I then merge together in Excel. Essentially
what I need
with two records in order to swap
the positions of (say) item 2 and 3. Of course you can do this pretty
easily inside a transaction, and you don't have to worry about the mess
of moving PK's.
Steve
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about this:
select round.*, stage.name from round
left join stage on stage.id = round.stage_id
ORDER BY round.score DESC;
Steve
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should be cached into RAM by the OS
at that point.
Also, I don't know what the state of the art is regarding RAM disks
these days, but for a read-only database, that seems like an option
(10gb of ram disk for your read-only data and 6 gb of ram for OS and
Pg).
Steve
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and
rebuilding them manually later?
Thanks for any insight on that (and I hope my question helps the OP as
well - if this seems off topic let me know),
Steve
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the column_name fields, building your column
list, excepting the column_names you wish to exclude..
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;Talahassee, FL
6;Frankfurt, GE
Steve
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this helps. Feel free to contact me on-list or off, if you want
to discuss more.
Steve
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that using
the regex operators (like ~* would be the way to go).
I thought I'd mention this other approach in case it was of interest
and you haven't run across it before.
Sincerely,
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go. I've forwarded this thread already to several people who work
with related issues, and they're very interested in some solutions as
well.
So stay in touch as you work on this, please.
Sincerely,
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#, but I'd guess
you can make it work. Might be simpler than all the escaping work..
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) NOT NULL,
data bytea
);
insert into test (filename, data)
values (E'c:\\tmp\\tst.tif', '1234');
select replace(filename, E'\\', E''), data from test
Does this do it?
Steve
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code there. Just feed it your images as
input and all should be good.
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))
AND (b.attribute = @secondAttr));
Also, any suggestions about how to figure out this on my own without
bugging the list in the future would be great. Thanks for any insight!
Steve
p.s. I posting in the same thread, but if you think I should have
started a new thread let me know for the future
updates, then you're good to go. It's a very
fast way to update all your tables to make sure the sequence #'s are
all valid, without having to look up the max value on each one (which
would also require that you shut off access to the table and for a much
longer time).
Hope that helps,
Steve
array?
I may not be the best person to answer the actual SQL question, but I
thought I'd clarify your requirements so the list members can have the
best chance of answering.
Steve
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construct a rule or trigger to validate
the
foreign key data on insert/update but that's out of my skill area.
Hi Steve,
So in your solution the f_table column is just text which needs to be
validated by a custom trigger?
Hi,
Yup - that's exactly what I'm suggesting. Storing the text value
the
foreign key data on insert/update but that's out of my skill area.
Hope that helps a little,
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At 09:50 PM 9/29/2008, Richard Broersma wrote:
On Mon, Sep 29, 2008 at 7:48 PM, Steve Midgley [EMAIL PROTECTED]
wrote:
In my specific case it turns out I only had duplicates, but there
could have
been n-plicates, so your code is still correct for my use-case
(though I
didn't say
At 05:38 PM 9/26/2008, Oliveiros Cristina wrote:
In-Reply-To: [EMAIL PROTECTED]
References: [EMAIL PROTECTED]
[EMAIL PROTECTED]
[EMAIL PROTECTED]
Howdy, Steve.
SELECT id
FROM dummy a
NATURAL JOIN (
SELECT fkey_id,name
FROM dummy
GROUP BY fkey_id,name
HAVING COUNT(*) 1 AND SUM
!
Steve
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advice on either of these solutions. I'm going to learn
a lot here if someone can pound it into my head.
Thanks,
Steve
It seems to be returning any records that have sequential id's
regardless
At 11:02 AM 9/26/2008, Richard Broersma wrote:
On Fri, Sep 26, 2008 at 10:39 AM, Steve Midgley [EMAIL
of course is prone to all kinds of different problems (like lazy
developers who code around the OO validation checkers!).
Thanks for giving such a great explanation as to the value of natural
keys! You haven't won me over, but you did teach me something - which I
appreciate.
Best,
Steve
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just end up turning into fact tables!
:)
In summary: I've never heard someone say they've been bitten by using
an arbitrary surrogate key system, but I myself have been bitten and
have heard lots of stories of problems when using natural keys.
I hope this helps some,
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Sorry for the fairly long post.
I'm having a big problem trying to update one table from another in
PostgreSQL 8.3.1.
I have a lookup table called termgroup:
# select * from termgroup;
termgroupname | mindays | maxdays
---+-+-
1-30 days | 1 | 30
31-59
clause? I could be
misunderstanding the whole thing though..
Steve
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a pure-sql
solution in Pg as well but this method should work across any SQL
platform, which seems like one of your requirements.
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At 03:51 PM 7/31/2008, Tom Lane wrote:
Steve Midgley [EMAIL PROTECTED] writes:
At 07:29 AM 7/16/2008, Tom Lane wrote:
I think what is happening is that ORDER BY knows that and gets rid
of
the duplicate entries while DISTINCT ON fails to do so.
Of course removing the duplicate from both
procedure which grabs all the
data from this data table, aggregates it and saves it to warehouse
table. You could aggregate against your datetime stamp by N hours or
days as well. If this idea is of interest you can write back to the
list or off-list to me for more info.
Steve
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case above is breaking my tests and preventing
me from implementing the idea. The code is generated by an application
layer which is not really paying attention to whether or not the two
CASE statements apply to the same field or not (sometimes they do
sometimes they don't)..
Thanks!
Steve
if this list were to limit itself only to public domain and open
copyright documentation for consideration.
Just two more cents from the peanut gallery on a Saturday afternoon,
Steve
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was created. If you restored from a dump or otherwise
recreated the database for any reason (version upgrade, machine
migration, disaster recovery, etc.), the timestamps would represent the
time of the restore, not the time of the creation of the original database.
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developers with a consistent set of
interfaces to obtain data that are not tied to the data tables
themselves. And allowing them to insert/update/manage tables via
structured interfaces as well.
Am I missing something?
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(or any other std) if you do not regularly
test against a set of platforms, your solution will converge on
supporting only the platforms you do regular test against.
I hope that helps,
Steve
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Allan Kamau wrote:
Hi Steve,
Am having difficulties (there is a chance I could be the only one)
trying to see how the results you've listed under I would want to
get: section can be generated from the information you have provided
in your implicit problem statement.
Remember the events
Steve Crawford wrote:
Allan Kamau wrote:
Hi Steve,
Am having difficulties (there is a chance I could be the only one)
trying to see how the results you've listed under I would want to
get: section can be generated from the information you have provided
in your implicit problem statement
it
might be a day or two. I am looking for a query that will list any
device having no variation in the recent events.
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and skin, where the
following words do not appear between the words chicken and skin: beef,
pork, cow, pig, etc..
Just some thoughts for you there.
Best,
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nutrient_data where nutrient_no=203;
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from nutrient_data where ndb_no =
13473 order by nutrient_value limit 5;
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!
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with and without accents to make searching
easier across keyboards/locales.
I hope this helps too -- I think Craig has given you the lion's share
of good advice for sure - and I definitely follow the practices more or
less as he laid them out as well.
Sincerely,
Steve
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into yourtable SELECT * from xxx;
DROP TABLE xxx;
If you are so close to out-of-space on your disk that you don't have the
room those 90,000 records will require, you may have to dump/restore
using another machine.
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was done by my middleware
connection wrapper to ODBC and none was done by ODBC itself. Once I got
to that point, I was able to get some decent performance out of ODBC.
I hope some of these ideas helps! Feel free to write back on or off
list.
Sincerely,
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for the solution mill, hopefully!
Steve
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very poor performance on
large tables. EXPLAIN will not reveal this. You might want to set the
server to log all transactions and see what the app is really doing at
the server level.
Cheers,
Steve
just need consecutive row-numbering on output (not in the table)
and if the row numbering doesn't need to match the same record each
time, you can create a temporary sequence and select
nextval('tempsequence'), from yourtable.
Cheers,
Steve
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might
not work b/c two different child shells are run:
system.exec(export PGPASSWORD=pass1234);
system.exec(psql my command here);
I think you want something more like this psuedo code:
system.set_environment(PGPASSWORD)=pass1234;
system.exec(psql my command here);
I hope this helps,
Steve
finds
your input and mine useful in coming up with a final answer to his
issue. Thanks for taking the time to consider the issue and I'll look
forward to any additional ideas or comments you have on this too!
Sincerely,
Steve
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your
sparse index space and generating lots of misses.
Hope that helps,
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At 12:36 PM 3/18/2008, D'Arcy J.M. Cain wrote:
On Tue, 18 Mar 2008 12:23:35 -0700
Steve Midgley [EMAIL PROTECTED] wrote:
1) Create a second field (as someone recommend on this list) that
is an
MD5 of your primary key. Use that as your accessor index from the
web
I strongly disagree
Aarni Ruuhimäki wrote:
Thanks Steve,
I'm not sure if I quite grasped this. It gives a bit funny results:
SELECT sum ((date_smaller(res_end_day, '2007-12-31'::date) -
date_larger(res_start_day, '2006-12-31'::date)) * group_size) AS
days_in_period,
c.country_name AS country
FROM product_res
,
Steve
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dates
but move the start base back one day so anyone starting prior to Feb 1
gets the extra day added.
Cheers,
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a little!
Steve
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To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-sql
if you reset
that key, then your table will start issuing keys at that new number.
Another way to be more safe is to +5 your sequence, so that even if a
few inserts slip in, you're still ahead of the game..
Steve
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To make changes
just
works a little cleaner / fewer unexpected surprises.
Like I said, I don't know if this is your issue (and Vista), but it's
been my experience with WinXP and file paths in Postgresql.
Best,
Steve
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To make changes to your
. Is there an
alternative?
You mean like:
COMMENT ON mytable IS 'This is my table. Mine, mine, mine';
You can also comment columns, databases, functions, schemas, domains, etc.
Cheers,
Steve
. This often means that the product
has severely limited its use of appropriate PostgreSQL features in order
to remain compatible with the other backends.
Cheers,
Steve
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TIP 2: Don't 'kill -9' the postmaster
? Not sure how to make WinAPI calls from PG -
perhaps someone on list has experience or references for that:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/rpc/rpc/uuidcreate.asp
HTH,
Steve
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TIP 2: Don't 'kill
nicer.
Any assistance is appreciated! Thanks,
Steve
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of course.
I'll readily admit my limited experience, and I'm sure others on this
list have far better information. I hope this gets you started anyway.
Sincerely,
Steve
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TIP 2: Don't 'kill -9' the postmaster
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