Seconded.
|---------+---------------------------->
| | "Laurent" |
| | <[EMAIL PROTECTED]|
| | ternet.fr> |
| | |
| | 12/10/2005 23:36 |
| | Please respond to|
| | sqlite-users |
| | |
|---------+---------------------------->
>--------------------------------------------------------------------------------------------------------------|
|
|
| To: <sqlite-users@sqlite.org>
|
| cc:
|
| Subject: Re: [sqlite] SQL Window/OLAP functions
|
>--------------------------------------------------------------------------------------------------------------|
Hello,
I was just looking for a statiscal package linked with SQLITE.
>
> Using SQLite in conjunction with a powerful statistical data analysis
> programming language like R is an excellent example of a use where
> windowing functions can be hugely helpful. Unfortunately, I've never
> had a compelling need to use SQLite for that, otherwise I'd probably
> take a shot at adding support for the SQL:2003 Window/OLAP stuff. :)
>
I can confirm that there would be some interest in having such a library.
Best regards,
Laurent.
==
----- Original Message -----
From: "Andrew Piskorski" <[EMAIL PROTECTED]>
To: <sqlite-users@sqlite.org>
Sent: Wednesday, October 12, 2005 2:34 PM
Subject: [sqlite] SQL Window/OLAP functions
> On Wed, Oct 12, 2005 at 05:12:05AM -0500, pilot pirx wrote:
> > Subject: [sqlite] Please, please do _not_ remove this feature from
SQLite...
>
> > While using SQLite for some time (with R package, www.r-project.org)
> > I did admire its functionality and speed. Then I did discover a
> > hidden SQLite feature of immense usefulness - not available in other
> > databases. SQLite can compute Fibonacci numbers! (I will explain why
>
> Transaction visibility features do vary, although often it doesn't
> matter anyway. E.g., here's a dicussion of how (at least as of early
> 2004), PostgreSQL's docs were quite confused about certain subtleties,
> but what I find interesting, is this was still something that in
> practice had never really mattered to the mostly hard-core RDBMS
> programmers talking about it in that thread:
>
> http://openacs.org/forums/message-view?message_id=176198
>
> > UPDATE fib SET
> > val = (SELECT h1.val FROM fib as h1 where pos = fib.pos - 1) +
> > (SELECT h2.val FROM fib as h2 where pos = fib.pos - 2)
> > WHERE pos > 2;
>
> I don't see why this is such a great feature. Without it, worst case,
> you could still write a simple little loop which would issue one
> update statement for each row, all within a single transaction. No?
>
> > This is an _immensely_ useful functionality when one needs to
> > compute various recursive functions. For example exponential moving
> > average, used frequently in financials. Or Kalman filter (and many
>
> Vastly more useful for moving average and the like would be real
> windowing/grouping functions, like Oracle's "analytic" functions. I'm
> not thrilled by their particular syntax, but the functionality is
> INCREDIBLY useful. (And on the other hand, I haven't thought of any
> obviously better syntax, either.)
>
> Hm, an amendement to the SQL:1999 spec added windowing support, and
> SQL:2003 includes that, I think as features T611, "Elementrary OLAP
> functions" and T612, "Advanced OLAP functions". Apparently Fred Zemke
> of Oracle was the author of that SQL spec, and IBM also supported it,
> so the SQL:2003 syntax and behavior is probably very similar (maybe
> identical?) to what Oracle 8i, 9i, and 10g and IBM's DB2 already have.
> PostgreSQL, as of 8.0, doesn't support it yet.
>
> http://www.wintercorp.com/rwintercolumns/SQL_99snewolapfunctions.html
> http://www.ncb.ernet.in/education/modules/dbms/SQL99/OLAP-99-154r2.pdf
> http://www.wiscorp.com/sql/SQL2003Features.pdf
> http://troels.arvin.dk/db/rdbms/#select-limit-offset
> http://www.postgresql.org/docs/8.0/interactive/features.html
> http://en.wikipedia.org/wiki/SQL
>
http://www.sigmod.org/sigmod/record/issues/0403/E.JimAndrew-standard.pdf
> http://www.oracle.com/oramag/oracle/01-jul/o41industry.html
>
> SQLite basically supports just SQL-92, it doesn't have any of these
> newer SQL:1999 or SQL:2003 features, right?
>
> Using SQLite in conjunction with a powerful statistical data analysis
> programming language like R is an excellent example of a use where
> windowing functions can be hugely helpful. Unfortunately, I've never
> had a compelling need to use SQLite for that, otherwise I'd probably
> take a shot at adding support for the SQL:2003 Window/OLAP stuff. :)
>
> --
> Andrew Piskorski <[EMAIL PROTECTED]>
> http://www.piskorski.com/
>
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