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Hello!
Over the last few weeks we were profiling our usage of SQLite. We
found three common patterns that are not treated well by the
optimizer. I believe at least two of them can be fixed easily and they
are included below.
1) Consider the following schema:
create table a (a, b, c, d);
create
Hello!
I'm seeking some advice on improving SQLite's query planning in
relation to foreign keys. Sometimes it may be useful to exploit the
fact that the columns in separate tables refer to the same
information.
Consider the following schema:
create table a (a, b, c);
create table b (a, b
Is version 3.7.8 scheduled for September 28 (according to changes.in)
or August 28 (bi-monthly schedule)?
Thanks,
Filip Navara
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I finally figured out how to load multiple dot commands or settings
from the command line tool. (Some users only have the default binary to
rely on, ya know.) Since I have never found this information on the web
before, I thought I would post it here to share the information.
To load options
Use of a heredoc to simulate a session...or staging it all into a file for
use via .read are good too.
On Aug 16, 2011 6:55 AM, Ryan Henrie r...@henrie.org wrote:
I finally figured out how to load multiple dot commands or settings
from the command line tool. (Some users only have the default
In the sqlite3's .dump command's output, the binary blobs may
either be represented as hexadecimal X''-literals, or as text
strings.
I wonder, how do I force sqlite3(1) to exclusively use the X''
representation?
Also, are the .dump and .read
On Tue, Aug 16, 2011 at 5:37 AM, Filip Navara filip.nav...@gmail.comwrote:
Is version 3.7.8 scheduled for September 28 (according to changes.in)
or August 28 (bi-monthly schedule)?
Current target release date is 2011-09-28. But that might change.
Meanwhile, the trunk is stable if you want to
On 16 Aug 2011, at 9:39am, Filip Navara wrote:
create table a (a, b, c, d);
create index aIdx on a (a, d);
Now the data in columns b and c can be pretty large. Let's make
the following query:
select a, d from a;
Full-table scan is done even if an index exists that covers all the
On Tue, Aug 16, 2011 at 2:24 PM, Simon Slavin slav...@bigfraud.org wrote:
On 16 Aug 2011, at 9:39am, Filip Navara wrote:
create table a (a, b, c, d);
create index aIdx on a (a, d);
Now the data in columns b and c can be pretty large. Let's make
the following query:
select a, d from a;
On Tue, Aug 16, 2011 at 8:54 AM, Filip Navara filip.nav...@gmail.comwrote:
On Tue, Aug 16, 2011 at 2:24 PM, Simon Slavin slav...@bigfraud.org
wrote:
On 16 Aug 2011, at 9:39am, Filip Navara wrote:
create table a (a, b, c, d);
create index aIdx on a (a, d);
Now the data in columns b
On Tue, Aug 16, 2011 at 2:56 PM, Richard Hipp d...@sqlite.org wrote:
On Tue, Aug 16, 2011 at 8:54 AM, Filip Navara filip.nav...@gmail.comwrote:
On Tue, Aug 16, 2011 at 2:24 PM, Simon Slavin slav...@bigfraud.org
wrote:
On 16 Aug 2011, at 9:39am, Filip Navara wrote:
create table a (a, b,
On Tue, Aug 16, 2011 at 2:54 PM, Filip Navara filip.nav...@gmail.com wrote:
On Tue, Aug 16, 2011 at 2:24 PM, Simon Slavin slav...@bigfraud.org wrote:
On 16 Aug 2011, at 9:39am, Filip Navara wrote:
create table a (a, b, c, d);
create index aIdx on a (a, d);
Now the data in columns b and c
On Tue, Aug 16, 2011 at 2:19 PM, Richard Hipp d...@sqlite.org wrote:
On Tue, Aug 16, 2011 at 5:37 AM, Filip Navara filip.nav...@gmail.comwrote:
Is version 3.7.8 scheduled for September 28 (according to changes.in)
or August 28 (bi-monthly schedule)?
Current target release date is 2011-09-28.
On 16 Aug 2011, at 1:54pm, Filip Navara wrote:
On Tue, Aug 16, 2011 at 2:24 PM, Simon Slavin slav...@bigfraud.org wrote:
On 16 Aug 2011, at 9:39am, Filip Navara wrote:
Full-table scan is done even if an index exists that covers all the
data required by the query.
That's a little
Wanted to know if Sqlite can do simple math when there is a break in
sequence in the data. For example the foll. table is sorted by Longitude and
then Distance:
Id Longitude Distance IVmean IVsum IVcount
42 71.0 10 10.5000 221
43 71.0 10 29.4286 28
You can't replace multiple rows in a single insert/update/delete statement.
You might consider copying the duplicates to a temp table, delete them
from the old then use a select on the temp table to generate the new
rows for the old table. The select portion would be something like
select
I think it will have better performance if you do that in your
programming language. But if you insist on SQL it would look like
this:
update table_name set IVmean =
(select sum(IVsum)/sum(IVcount) from table_name t
where t.Longitude = table_name.Longitude
and t.Distance = table_name.Distance);
Hi,
New to SQLite3 and am I using Delphi-5 and Zeos.
I created a database using the Text DataType but it shows up in a TDBGrid as
[memo].
I have read that I need to change the DataType to VarChar without a length
designation and the text will show correctly.
I am sure this has been asked a
On 16-08-2011 20:15, Dave Jeremy wrote:
Hi,
New to SQLite3 and am I using Delphi-5 and Zeos.
I created a database using the Text DataType but it shows up in a TDBGrid as
[memo].
I have read that I need to change the DataType to VarChar without a length
designation and the text will
On 8/16/2011 12:12 PM, Luuk wrote:
On 16-08-2011 20:15, Dave Jeremy wrote:
Hi,
New to SQLite3 and am I using Delphi-5 and Zeos.
I created a database using the Text DataType but it shows up in a TDBGrid as
[memo].
I have read that I need to change the DataType to VarChar without a length
Thanks much for the responses - they were helpful but was not quite what i
wanted. Perhaps I was not clear. So, here goes...
The data is sorted by Longitude and then by Distance. Whenever there are
repeated values of Distance within a Longitude, I want the Sum and Count to
be added and divided -
In the process of converting database from sql express to sqlite, I have the
following query that runs very slow on sqlite compared to sql server:
SELECT distinct Table1.Column1, Table2.Column2, Table1.Column2
FROM ( Table1 INNER JOIN Table2 ON Table1.Column1 = Table2.Column1)
WHERE (
On 16 Aug 2011, at 9:58pm, Anantha Prasad wrote:
The data is sorted by Longitude and then by Distance. Whenever there are
repeated values of Distance within a Longitude, I want the Sum and Count to
be added and divided - for example,
Here is the table:
Longitude Distance AvgColz SumColz
On 16 Aug 2011, at 10:05pm, Yonnas Beyene wrote:
SELECT distinct Table1.Column1, Table2.Column2, Table1.Column2
FROM ( Table1 INNER JOIN Table2 ON Table1.Column1 = Table2.Column1)
WHERE ( Table1.PrimaryKeyID =?) And ( Table1.Column1 IS NOT NULL)
The explain query plan looks like,
0 0 0
On 8/16/2011 4:58 PM, Anantha Prasad wrote:
The data is sorted by Longitude and then by Distance. Whenever there are
repeated values of Distance within a Longitude, I want the Sum and Count to
be added and divided
select Longitude, Distance, sum(SumColz) / sum(CountColz) as AvgColz
from
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