Re: SQL Equivalent of CRTLF

[Charles Wilt <charles.wilt@xxxxxxxxx>]

I'd highly recommend not using (the default) ADD ALL COLUMNS.

For SQL use, KEYS ONLY is all you need.

For an SQL index you intend to use with RPG, explicitly list the columns
you need; even if that's all the currently existing columns.

If at some point you add another column to the table, the RPG program using
an SQL index (or DDS logical) with an explicit list of columns will not
need to be recompiled.

Don't worry about creating multiple indexes/LF with the same keys but
different columns, the access path will be shared so other than a few bytes
for the object definition, there's no additional disk or
maintenance overhead.

Charles


On Fri, Oct 16, 2020 at 11:38 AM Greg Wilburn <
gwilburn@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

> OK... that's what I tried with the "Manage Schemas" in ACS.  But my index
> (LF) only had the two key fields available.
>
> I see from your article:   "RCDFMT myFile ADD ALL COLUMNS"
>
> Is that why?  I've never seen that before.  But I think I found the
> options in ACS.
>
> Now my issue is that I don't have the time to learn and experiment with
> DDL (which is often the case).  I have to get this done and move on.
>
> I can see why moving away from DDS has taken so long.
>
>
> -----Original Message-----
> From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of
> Birgitta Hauser
> Sent: Friday, October 16, 2020 1:09 PM
> To: 'RPG programming on IBM i' <rpg400-l@xxxxxxxxxxxxxxxxxx>
> Subject: RE: SQL Equivalent of CRTLF
>
> If you want a keyed access with native I/O you need to create an index!
> BTW SQL Indexes can not be specified in an SQL Statement, but they can be
> used in composition with native I/O like any keyed DDS described logical
> file.
> You may read the following article:
> SQL indexes and native I/O - no contradiction
>
> https://developer.ibm.com/technologies/systems/articles/i-sql-indexs-and-nat
> ive-io/
> <https://developer.ibm.com/technologies/systems/articles/i-sql-indexs-and-native-io/>
>
> ... and SQL is much more powerful and much easier than DDS
> ... and DDS is stabilized and outdated
>
> Mit freundlichen Grüßen / 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 losing them? Not training them
> and keeping them!"
> "Train people well enough so they can leave, treat them well enough so they
> don't want to." (Richard Branson)
>
>
> -----Original Message-----
> From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Greg
> Wilburn
> Sent: Freitag, 16. Oktober 2020 16:47
> To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
> Subject: SQL Equivalent of CRTLF
>
> I've been using SQL I programs and to create views for quite some time.
> I'm
> trying to force myself away from DDS.
>
> So I created a new table with SQL... now I need to create a subset of that
> table by way of a logical file (I want to use RPG Native access in my
> program), which can also be updated.
>
> Is there a simple way to create a view of my table that contains all
> columns
> "where" one of the columns is blank?
>
> My current take on DDL versus DDS is that DDS is much, much easier and
> faster to use.
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