A data column in a link table contains comma-separated string data, where
each value represents a value to link to another table. (many-to-many
relationship)
How do you 'parse' a table entry like: "4,66,51,3009,2,678, ." to extract
these values and use them in an SQL statement, perhaps a WHERE
This question regards SQLite (3.6) performance. (Lengthy because I want to
describe the environment.)
. Win-7 (64-bit, though I don't know if SQLite uses 64-bit).
. 3 year old HP laptop with Intel Core Duo CPU P8400 @ 2.27GHz with
only 4GB memory
. 286GB HD (50% full) +
Thank you for your responses.
I was hoping for an easy hardware solution, like more memory or a faster HD
. but it looks like indices and table design are where I need to focus.
peterK
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I have a large DB and want to improve query performance.
Context: the DB contains 2 tables representing nationwide claim data:
. a CLAIMS table = 43M rows with indices on claim_no and stateCounty
code; and
. a LINE table = 85M rows with indices on claim_no and HCPCS (a 5
Thank you Simon for responding to my questions. Your phonebook (FName/LName)
analogy clearly explained why 2 indices per table per select won't work.
Let me provide a bit more info and a possible attempt to implement your
suggestions for better indices.
My 'bread and butter' query counts the
t-Type: text/plain; charset=windows-1252
On 9 Jul 2013, at 6:06pm, peter korinis <kori...@earthlink.net> wrote:
> So, to implement your suggestion of crafting better indices, here?s my
approach:
> 1. First action is joining the 2 tables on claim_no. {Therefore
claim_no should
From: "James K. Lowden" <jklow...@schemamania.org>
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] SQLite Use of Indexes
Message-ID: <20130712161038.b8b4df84.jklow...@schemamania.org>
Content-Type: text/plain; charset=US-ASCII
On Mon, 8 Jul 2013 15:32:21 -0400
I'm new to SQLite . not a programmer . not a DBA . just an end-user with no
dev support for a pilot project (single user, no updates, just queries).
I want to analyze the data contained in a 44GB csv file with 44M rows x 600
columns (fields all <15 char). Seems like a DBMS will allow me to
Solutions Operating Unit
Northrop Grumman Information Systems
From: sqlite-users-boun...@sqlite.org [sqlite-users-boun...@sqlite.org] on
behalf of peter korinis [kori...@earthlink.net]
Sent: Tuesday, May 01, 2012 3:06 PM
To: sqlite-users@sqlite.org
Subject: EXT
thoroughly
>tested for large data sources.
>
>
>
>Michael D. Black
>
>Senior Scientist
>
>Advanced Analytics Directorate
>
>Advanced GEOINT Solutions Operating Unit
>
>Northrop Grumman Information Systems
>
>________
&
] On Behalf Of Warren Young
Sent: Thursday, May 03, 2012 9:36 AM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] is SQLite the right tool to analyze a 44GB file
On 5/1/2012 2:06 PM, peter korinis wrote:
> Is SQLite the wrong tool for this project?
Probably.
SQLite is a data stor
Forgive me ... but what is SQLiteman?
Will "import table data" help me load a csv file into a SQLite table?
Thanks,
peter
-Original Message-
From: sqlite-users-boun...@sqlite.org
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Simon
Sent: Wednesday, May 02, 2012 3:03 PM
To: General
sqlite.org
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Oliver Peters
Sent: Thursday, May 03, 2012 7:23 PM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] is SQLite the right tool to analyze a 44GB file
Am 03.05.2012 19:59, schrieb peter korinis:
> I have R but really haven't used it much. I know
44GB file
On Tue, May 01, 2012 at 04:06:01PM -0400, peter korinis wrote:
> I'm new to SQLite . not a programmer . not a DBA . just an end-user
> with no dev support for a pilot project (single user, no updates, just
queries).
>
>
>
> I want to analyze the data contained in a 44GB
Database
Subject: Re: [sqlite] is SQLite the right tool to analyze a 44GB file
On 4 May 2012, at 4:02pm, peter korinis <kori...@earthlink.net> wrote:
> Sqlitespy looks good ... I will try it.
> website says download contains sqlite itself, which I already have -
> will there be a
e or nothing more?
I tried several different ways but still get same error when I try to
import.
Without knowing syntax, I'm forced to ask these dumb questions or give up
(not) . since no good documentation - sorry.
Thanks,
Have you ran *.mode csv*?
Jonas Malaco Filho
2012/5/7 peter ko
On 7 May 2012, at 4:41pm, peter korinis wrote:
> My input file is a comma-delimited text file
> When I run .import I get the following "Error: FILE line 1: expected 46
> columns of data but found 1"
> It seems .import is not recognizing comma delimiter.
Thanks for advice
http://www.pantz.org/software/sqlite/sqlite_commands_and_general_usage.html
had the explanation/example I needed to get the import done successfully.
Using ".separator ," was what I was missing.
peter
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I can't find a table I just created and imported data.
With .databases I can see 'main' but with no location on disk and with .
tables I see the table.
Instructions says they are save . but where. I can't find them with windows
search?
pk
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Simon
I searched the entire disk for the table name and no matches.
pk
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I did NOT specify a file name when I started sqlite3 - so I guess all is
lost. I'll have to redo it.
So then the first thing is to specify the db (file) name - what syntax? I
tried typing a file name (test.db) but error.
pk
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