I'm trying to optimise some of my queries, and I would like to know if
bitwise operators in terms will still use an index, or if I should be
thinking about moving the more important values to separate columns that
could be checked for equality.
At the moment, I have an index created much like:
Hello!
See the test:
$ cat /tmp/test
package require sqlite3
sqlite3 db :memory:
db eval {create table test(a int);insert into test values (1);}
proc test {label sql result} {
global i j
puts -nonewline $label\t
set _result [db eval $sql]
if { $_result
Hello!
On Thursday 17 September 2009 07:25:33 P Kishor wrote:
pursuant to a recent email, I am wondering if I can build
extension-functions.c
http://www.sqlite.org/contrib/download/extension-functions.c?get=25
so that it is permanently available within sqlite library, and not
just when
On 10/9/09 10:54 , Cjkalbente jkalbe...@yahoo.com wrote:
If you need an ETL open source program, best thing is to check Talend Open
Studio. It is a practical and easily learnable program for ETL, data
migration and synchronization.
The bug reporting, the community and the forum are active.
Try it on a PC if you can one day! It is a powerful solution even though it
is free and open source. Quality, to me, is good.
Jean-Denis Muys-2 wrote:
On 10/9/09 10:54 , Cjkalbente jkalbe...@yahoo.com wrote:
If you need an ETL open source program, best thing is to check Talend
Open
Roger Binns wrote:
SQLite provides you the tools to find out for yourself. In the shell do
'.explain' and then give it your query prefixed with 'EXPLAIN'. You'll get
the virtual db engine code for the query printed out.
...
In answer to your question, yes the index is used. You can see
On Oct 8, 2009, at 16:16 , Jay A. Kreibich wrote:
On Thu, Oct 08, 2009 at 08:29:10AM +0200, Fredrik Karlsson scratched
on the wall:
Yes, that would have been my guess too, but I am on CET, which I
understand is UTC+1.
CET is CEST in summer, which is UTC+2
Cheers, Peter
Hey there,
this has already been requested over two years ago (2007-08-30), but the ticket
(#2604) is still pending:
http://www.sqlite.org/cvstrac/tktview?tn=2604
The patch by Scott Hess (2008-08-28) looks sane - should be no problem to apply.
Without this statement, I have to check
In answer to your question, yes the index is used. You can see instructions
prefixed by Idx that aren't there when the index doesn't exist.
I just want to warn you: the index is used but not for finding
appropriate value of col_c (as your question seem to imply). It is
used only to find
Daniel Wickes wrote:
I'm trying to optimise some of my queries, and I would like to know if
bitwise operators in terms will still use an index, or if I should be
thinking about moving the more important values to separate columns that
could be checked for equality.
At the moment, I have
change your query a bit when you use bitwise operations, in your case when
you
have 'AND col_c32' you may add 'AND col_c=32'. now index will be used
col_c = 64 does pass second condition and doesn't pass first one. ;-)
Bitwise operators cannot be changed so easily to inequalities.
Pavel
Pavel Ivanov wrote:
change your query a bit when you use bitwise operations, in your case when
you
have 'AND col_c32' you may add 'AND col_c=32'. now index will be used
col_c = 64 does pass second condition and doesn't pass first one. ;-)
Bitwise operators cannot be changed so easily to
i didn't said this condition should be *replaced* , i said that inequality
should be *added*. then index could limit resultset, but bitwise operator will
still be used, only on hopefully smaller set of data
Oh, sorry, I didn't understand you correctly then. But I believe that
this condition
Happy Friday everyone!
I've got several tables each representing a specific
language which my application uses to access translated strings. It'd
be extremely useful if I were able to alias a table as CurrentLanguage
as opposed to directly referencing the actual name. This saves
Hi,
yes, creating a table will duplicate your data. However, a view will not:
create view CurrentLanguage as select * from SomeLanguage;
see http://www.sqlite.org/lang_createview.html
Martin
Shaun Seckman (Firaxis) wrote:
Happy Friday everyone!
I've got several tables each
Hi Shaun,
It'd be extremely useful if I were able to alias a table as
CurrentLanguage as opposed to directly referencing the actual
name. This saves me from having to tweak my lookup statements on
the fly to change the table name being accessed. Is it possible to
perform such an
I agree with Tom. With the proper indexes a single table for all
languages is the way to go.
I don't think a view for each language is necessary--just make a
function that takes language and whatever you use to look up the
localized strings, and returns the localized string.
Further, there are
It's an ioDrive. We updated the firmware to the just-released version,
and it made a WORLD of difference. It's now performing at the level we'd
expect (which is quite impressive!)
Talking with their performance engineer, they do indeed suggest
disabling the OS cache in some cases. We haven't
I've reduced a problem that I'm having to the following test case.
I insert two rows into an rtree table. In the first case when I
select chromStart and chromEnd I get the same values as I inserted.
In the second case the chromEnd is 1 greater than what I inserted. In
the third case chromStart
I have a database containing a single table, with FTS3:
create virtual table my_fts_table using fts3
(
last_name text not null,
first_name text not null,
middle_name text not null,
identifiers text not null,
address_1 text not null,
city
On Oct 9, 2009, at 9:02 AM, Marco Bambini wrote:
Hello Dr. Hipp,
I understand that you are probably against this request but I really
would like to have a way to automatically retrieve the rowid column
from a select statement without the needs to manually add the rowid
column to the
On Fri, Oct 09, 2009 at 10:50:49AM -0700, George Hartzell scratched on the wall:
It seems odd. Are the values large enought that they're causing
problems with the 32-bit floats?
Yes. 32-bit IEEE 754 floats offer 23+1 bits of precision, which
translates to about 7.2 base-10 digits. Those
Your analysis is correct.
One way this is often fixed in full-text-search systems is to keep
index stats so that the more specific bits of the query can come
first. In this case, nicky AND nigel gives you a small enough
result set that it would be more efficient to scan the matched
documents for
George Hartzell writes:
I've reduced a problem that I'm having to the following test case.
I insert two rows into an rtree table. In the first case when I
select chromStart and chromEnd I get the same values as I inserted.
In the second case the chromEnd is 1 greater than what I
I'm trying to correctly word an SQL statement.
Data Fields: ID, Date, Month, Day, Year, Price
Problem: When provided the starting Month/Day numbers, and ending Month/Day
numbers, what is the correct way to SQL the database so that the recordset
created returns as follows (assume 4 years of
Consider a wiki that lets you edit rows in a db table. Each page is a
row in the table, and has fields that anyone can edit. Like all wikis,
it keeps a history of edits (including who made the edits), and lets
you revert an edit, or even delete a row (page) completely.
Has anyone implemented
Rick Ratchford r...@amazingaccuracy.com
Data Fields: ID, Date, Month, Day, Year, Price
Problem: When provided the starting Month/Day numbers, and ending
Month/Day numbers, what is the correct way to SQL the database so
that the recordset created returns as follows (assume 4 years of
data):
Thank you Igor. I will. :-)
Cheers!
Rick
#-Original Message-
#From: sqlite-users-boun...@sqlite.org [mailto:sqlite-users-
#boun...@sqlite.org] On Behalf Of Igor Tandetnik
#Sent: Friday, October 09, 2009 6:46 PM
#To: sqlite-users@sqlite.org
#Subject: Re: [sqlite] Need Help SQL
#
#Rick
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