Ok, if that is the case, why when I do a STRSQL and type in CREATE VIEW
it shows the ORDER BY clause?
From: vhamberg@xxxxxxxxxxx
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 09/23/2008 11:14 AM
Subject: Re: AW: DDL Discussion continued
----------------------------------------------------------------------
No - you can't put order by in a view - pure sql does not allow that -
indexes and views are different and separate creatures - unlike LFs, which
CAN combine the 2 concepts
Some other RDBMS do allow order by in views - MySQL comes to mind.
-------------- Original message --------------
From: Doug Palme <DPalme@xxxxxxxxxxx>
> I have seen some refer to indexes as similar to a keyed logical file,
> which certainly makes sense to me....however can you not also do the
same
> thing with a view? IE: Use Order By in a view statement?
>
> From: Doug Palme
> To: Midrange Systems Technical Discussion
> Date: 09/23/2008 09:58 AM
> Subject: Re: AW: DDL Discussion continued
>
> ----------------------------------------------------------------------
>
> Thanks.....
>
> From: "Birgitta Hauser"
>
> To: "'Midrange Systems Technical Discussion'"
>
>
>
> Date: 09/22/2008 11:57 PM
>
> Subject: AW: DDL Discussion continued
>
>
> ----------------------------------------------------------------------
>
> Hi,
>
> you may also read the following whitepaper which discusses how to
> determine
> and create the best access paths (either SQL indexes or DDS described
> keyed
> logical files).
> Indexing and statistics strategies for DB2 for i5/OS
>
>
http://www-03.ibm.com/servers/enable/site/education/abstracts/indxng_abs.htm
> l
>
> Mit freundlichen Gru:ssen / Best regards
>
> Birgitta Hauser
>
> "Shoot for the moon, even if you miss, you'll land among the stars."
> (Les
> Brown)
> "If you think education is expensive, try ignorance." (Derek Bok)
> "What is worse than training your staff and loosing them? Not training
> them
> and keeping them!"
>
> -----Urspru:ngliche Nachricht-----
> Von: midrange-l-bounces@xxxxxxxxxxxx
> [mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von
> vhamberg@xxxxxxxxxxx
> Gesendet: Tuesday, 23. September 2008 03:59
> An: Midrange Systems Technical Discussion
> Betreff: Re: DDL Discussion continued
>
> Somehow got a quick hit of my palm on the touchpad on the last message -
> but
> my point was made already.
>
> You should read the manual that talks about optimization and access
> plans
> and all - it'll tell you why you need indexes for certain kinds of
> access
> -
> the better ones will not even be possible without an index under it. SQL
> may
> create its own index at time, if it thinks that will go faster than some
> other method.
>
> The link to the manual called Database Performance and Query
> Optimization,
> at V5R4, is
>
>
>
http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/rzajq/rzajq.pdf
>
> There'd be a similar manual at the other release levels.
>
> HTH
> Vern
>
> -------------- Original message --------------
> From: Doug Palme
>
> > We had our meeting this past week on DDL and I would like to get some
> > feedback from all of you....I know that some of the uses for a view is
> far
>
> > different than an index but if one is depending on the SQL engine to
> > determine the most efficient access path for the data, why even create
> > indexes? Is there any real advantage to creating them?
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