of the filter much more
difficult. A built-in soultion would be welcome.
Best regards, Edzard Pasma.
SQLite version 3.7.7.1 (APSW 3.7.7.1-r1)
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .schema group_split
Op 2-jun-2011, om 23:17 heeft Simon Slavin het volgende geschreven:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
>
> On 2 Jun 2011, at 7:24pm, Roger Binns wrote:
>
>> (Incidentally I am the author of a "competing" Python SQLite
>> binding and
>> hence know exactly which SQLite API calls r
Op 9-apr-2011, om 21:29 heeft Roger Binns het volgende geschreven:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> On 04/08/2011 02:40 PM, Edzard Pasma wrote:
>> Just found that the APSW shell does tabcomplete (and even for
>> tablenames). It is desc
Here is the unbroken link:
http://apidoc.apsw.googlecode.com/hg/shell.html
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Op 11-feb-2011, om 23:30 heeft Simon Slavin het volgende geschreven:
>
> On 11 Feb 2011, at 7:19pm, prad wrote:
>
>> does the sqlite3 interface have completion of sql key words?
>> in postgresql you can type SEL and press tab to complete.
>> is there such a thing for sqlite3?
>
> sqlite3 doesn't h
straightforward and you do not need to know about statement types and
their effect on transactions.
Edzard Pasma.
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ode line
sqlite> select * from (select [x].[a] from (select a from x) x);
a = 123
This also cuts off the unnecessary table alias.
If column descriptions could be changed to be like this by default?
Edzard Pasma
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On 9-nov-2010, at 18:22 Peter Pawlowski wrote:
> While debugging an issue with using SQLite with a Rails
> application, we
> discovered that the behavior of SQLite when setting the
> 'sqlite3_busy_timeout' option was unexpected.
>
> After reading and grokking the SQLite documentation about lock
Op 31-jul-2010, om 18:30 heeft Dan Kennedy wrote:
>
> On Jul 31, 2010, at 10:47 PM, Edzard Pasma wrote:
>
>> Op 31-jul-2010, om 14:16 heeft Dan Kennedy wrote:
>>
>>>
>>> On Jul 31, 2010, at 12:02 AM, Edzard Pasma wrote:
>>>
>>>>
Op 31-jul-2010, om 14:16 heeft Dan Kennedy wrote:
>
> On Jul 31, 2010, at 12:02 AM, Edzard Pasma wrote:
>
>> Hello,
>>
>> The following scenario raises a BUSY error immediately
>>
>> process A. keeps a write lock
>> process B keeps a read-lock and tri
Hello,
The following scenario raises a BUSY error immediately
process A. keeps a write lock
process B keeps a read-lock and tries to promote this to a write-lock
This is the traditional SQLite deadlock situation, detected by the
engine as soon as possible.
In my test this still occurs unchang
Op 24-mei-2010, om 17:59 heeft Dan Kennedy het volgende geschreven:
>
> On May 24, 2010, at 6:14 PM, Edzard Pasma wrote:
>
>> Hello, I found a blind spot of the query optimizer. This appears when
>> a table is accessed as a view. I think the problem can be phrased as
>>
Hello, I found a blind spot of the query optimizer. This appears when
a table is accessed as a view. I think the problem can be phrased as
"the optimizer failing to push an outer join predicate into a
view"... This simply means that the following example does not use
the existing index:
cr
Op 16-apr-2010, om 19:51 heeft D. Richard Hipp het volgende geschreven:
>
> On Apr 16, 2010, at 11:52 AM, Max Vlasov wrote:
>>
>> SELECT StihiAuthors.Id As AuthId, StihiAuthCandidates.Date as Date,
>> StihiAuthCandidates.Num as Num FROM StihiAuthors
>> INNER JOIN StihiAuthCandidates ON
>> StihiA
If the subject is transferring data from a web server to a central
database, I like to refer to a feature of an open source package that
I published myself. It is only a side-side feature, resulting from
the general design, but it was added with just this in mind. This
feature, 'Connecting
Op 6-feb-2010, om 18:03 heeft Eric Bohlman het volgende geschreven:
> BareFeet wrote:
>> In general, I think it's much better (performance and logic) to do
>> all you can in SQL, without passing values out of SQL results, into
>> your non-SQL code, then re-injecting back into another SQL query et
Op 11-jan-2010, om 1:15 heeft Nikolaus Rath het volgende geschreven
> Edzard Pasma writes:
>> Op 10-jan-2010, om 19:25 heeft Nikolaus Rath het volgende geschreven:
>>
>>> Filip Navara writes:
>>>>> I am accessing the same database from several threa
tion attach at least 20 further databases within
each of the 15 connections?
Does it open at least 250 files any other way?
If any yes, then you have too many open files!
Regards, Edzard Pasma
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--- edz...@volcanomail.com wrote:
> I wonder if an automatic rollback, as described in
> //www.sqlite.org/c3ref/busy_handler.html, is more powerful than a
> rollback programmed in SQL. Particularly if it is able to rollback
> pending queries from other cursors in the same connection. The
> prog
Hello,
I wonder if an automatic rollback, as described in
//www.sqlite.org/c3ref/busy_handler.html, is more powerful than a rollback
programmed in SQL. Particularly if it is able to rollback pending queries from
other cursors in the same connection. The programmed rollback fails here with
BusyE
Hello,
I wonder if an automatic rollback, as described in
//www.sqlite.org/c3ref/busy_handler.html, is more powerful than a rollback
programmed in SQL. Particularly if it is able to rollback pending queries from
other cursors in the same connection. The programmed rollback fails here with
BusyE
to write to the database and/or reader if new
> SHARED locks are denied while database is in a PENDING and/or
> EXCLUSIVE lock state ( again, this point it not clear in documentation ).
> Do I understand it correctly?
>
> --
> Dmitri Priimak
Hello Dmitri, I understaod it the same way. However recently I observed that a
PENDING lock does not perform its useful function (prevent writer starvation)
in case readers and writers are threads of a single process! May that be the
case? Best regards, Edzard Pasma.
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On Mon, Oct 5, 2009 at 8:33 AM, Edzard Pasma wrote:
>
>
> --- paiva...@gmail.com wrote:
>
> From: Pavel Ivanov
> To: General Discussion of SQLite Database
> Subject: Re: [sqlite] double calculation in SELECT
> Date: Mon, 5 Oct 2009 07:13:28 -0400
>
> First of all, do yo
--- paiva...@gmail.com wrote:
From: Pavel Ivanov
To: General Discussion of SQLite Database
Subject: Re: [sqlite] double calculation in SELECT
Date: Mon, 5 Oct 2009 07:13:28 -0400
First of all, do you really store several rows with the same id in the
table1? If no then you don't need 'group by
--- proxi...@land.ru wrote:
From: Michael
To: sqlite-users@sqlite.org
Subject: [sqlite] double calculation in SELECT
Date: Sun, 04 Oct 2009 15:31:47 +0700
Hello,
I have following SELECT statement in my program (Delphi+sqlite3):
good
news is that Unlock Notification should handle it
(http://www.sqlite.org/unlock_notify.html).
--- edz...@volcanomail.com wrote:
From: "Edzard Pasma"
To: "General Discussion of SQLite Database"
Cc:
Subject: Re: [sqlite] Busy Handler in Shared Cache Mode?
Date: Mon,
Hi Nikolaus,
Interesting to read your findings. I assume you finally disallowed
read_uncommitted. Trying to explain why the wait times can get longer, I come
to two reasons.
- the time slots where a read-lock is obtained become smaller.
This can be significant if there are a lot of transaction
--- nikol...@rath.org wrote:
> "Edzard Pasma" writes:
>> --- nikol...@rath.org wrote:
>>> "Igor Tandetnik" writes:
>>>> Nikolaus Rath wrote:
>>>>> I am accessing the same database from different threads. Each
>>>&g
--- nikol...@rath.org wrote:
> "Igor Tandetnik" writes:
>> Nikolaus Rath wrote:
>>> I am accessing the same database from different threads. Each thread
>>> has its own connection. I have set the busy timeout for each
>>> connection to 5000 milliseconds.
>>>
>>> However, in some testcases I still
.
> Regards
> /Cole
>
>
>
> -Original Message-
> From: sqlite-users-boun...@sqlite.org
> [mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Edzard Pasma
> Sent: 19 July 2009 11:50 AM
> To: kennethinbox-sql...@yahoo.com; General Discussion of SQLite Datab
I'd also make sure that all read-cursors are finished before starting a
transaction. Or, take the exclusive lock already before the queries (possibly
that is what was meant)
--- kennethinbox-sql...@yahoo.com wrote:
>From: Ken
>To: General Discussion of SQLite Database
>Subject: Re: [sqlite] M
Hello, I found an issue in group_concat, that appears mainly cosmetical,
however may be good to be aware of for those making a more creative use of this
function. See the ticket http://www.sqlite.org/cvstrac/tktview?tn=3923. Edzard.
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nserting the same products repeatedly in the stock table i jus
> want the quantity as well as the dates to be updated . and wen i insert a
> new product_batch_code to the purchase table its shuld be inserted in the
> stock table also...
>
> Edzard Pasma wrote:
>>
>> Sorry, this
Nuyt's
idea which may be more comfortable if you like to keep the SQL simple..
Edzard
--- edz...@volcanomail.com wrote:
From: "Edzard Pasma"
To: "General Discussion of SQLite Database"
Cc:
Subject: Re: [sqlite] how can we solve IF EXIST in SQLite
Date: Tue, 2 Jun 2
Hello, you are cleverer than you think. Your initial idea to use INSERT OR
REPLACE might look like:
INSERT OR REPLACE INTO stock_tab(stock_id, prod_batch_code, stock_qty,
stock_date)
SELECT
s.stock_id,
p.prod_batch_code,
IF_NULL (s.stock_qty, 0) + p.purchase_qty
DATETIME('NOW
ny unlock-notify callback registered, also if
for the same connection. But would not wish to complicate things. It is a
somewhat crazy case and may as well be dealt with in the application that
wishes to support it.
Thanks for this most interesting development,
Edzard Pasma
d SQLite's incredible speed in doing UPDATE :)
Edzard Pasma
--- sylvain.point...@gmail.com wrote:
From: Sylvain Pointeau
To: edz...@volcanomail.com, General Discussion of SQLite Database
Subject: Re: [sqlite] having the Top N for each group
Date: Sun, 15 Feb 2009 21:44:58 +0100
Hello,
on m
sales.period = period.period
order by sales.qty desc
limit 3);
-- Edzard Pasma
--- sylvain.point...@gmail.com wrote:
From: Sylvain Pointeau
To: sqlite-users@sqlite.org
Subject: [sqlite] having the Top N for each group
Date: Sat, 14 Feb 2009 09:21:15 +0100
Hello all,
I am wondering if we have
only the top-N. I thought may be SUBSTR is a further
solution. The use of LIMIT would be more elegant but I don't see how.
is a TopN function planned for the future version of sqlite?
?
Edzard Pasma
--- sylvain.point...@gmail.com wrote:
From: Sylvain Pointeau
To: sqlite-users@sqlit
--- robert.ci...@gmail.com wrote:
> I am still curious to know if there is a purely SQL way to do the same.
This can be achieved using group_concat:
select div,
rtrim (substr (s, 1, 10)) nr1,
rtrim (substr (s, 1, 10)) nr2,
rtrim (substr (s, 1, 10)) nr3
from (
select div, group_co
--- [EMAIL PROTECTED] wrote:
> Your approach only works in simple cases. The number of changes is a
> connection/sqlite3* wide number - ie any SQLite statements associated with it
> can cause changes. This would certainly be the case when multi-threading is
> used.
Yes, agreed
> Even in si
is
needed.
Edzard Pasma
--- [EMAIL PROTECTED] wrote:
From: "Edzard Pasma" <[EMAIL PROTECTED]>
To:
Subject: [sqlite] reporting number of changes
Date: Tue, 9 Dec 2008 01:36:39 -0800
Hello,
The API function sqlite_changes reports the number of rows changed in the last
update/inse
t the value is not reset for
other type of statements? Or is there an easy way to find if a statement was an
update?
Edzard Pasma
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times before noticing any
wait time at all.
May this be something for a new built-in function?
Thanks, Edzard Pasma
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or the rest I'm very happy with this version. Thanks, Edzard Pasma
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I found a number where the ROUND () function goes wrong:
SQLite version 3.2.5
Enter ".help" for instructions
sqlite> select round (9.95, 1);
:.0
Sorry, it must be that I have bad luck today
Edzard Pasma
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Tired of spa
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