RE: keys on 2 joined files? -- RPG400-L

Good point.  I do tend to mix them sometimes.  You covered it very well in
your previous post.

Rick

-----Original Message-----
From: rob@xxxxxxxxx [mailto:rob@xxxxxxxxx]
Sent: Tuesday, March 18, 2003 9:02 AM
To: RPG programming on the AS400 / iSeries
Subject: RE: keys on 2 joined files?

Small 'point of information' Rick.  SQL allows you to create a logical,
selecting fields and records with CREATE VIEW.  However a logical to order
records must be done with CREATE INDEX.  And the wonderful functions of
these two statements do not overlap.  So you can't even do the very
limited function available in DDS to sort upon a fields from a single file
in a join logical.  But with proper indexes built, and the data
manipulation of SQL available within your programs it is not as critical
as it would be if you were limited to only F specs.

Rob Berendt
--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
Benjamin Franklin




"Chevalier, Rick" <Rick.Chevalier@xxxxxxxxxxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
03/18/2003 09:20 AM
Please respond to RPG programming on the AS400 / iSeries

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        Subject:        RE: keys on 2 joined files?


Chris,

A couple people have mentioned using SQL as a solution.  If SQL is
available
to you as an option you might want to check into creating an SQL view.
This
allows you to join multiple files together, select records on any field(s)
from the joined files and order the result set any way you want.  It will
look like a logic file to your  RPG programs.  Performance will depend on
the size of the files being joined, selection and join criteria, existing
indexes over the joined files, and iSeries model you are running on.  The
underlying SQL statement is executed whenever the view is accessed.  We
have
one here that takes several seconds to display using DBU on our
development
iSeries model S30 but performs comparable to DDS based physical and
logical
files on our production iSeries model 890.

HTH,

Rick

-----Original Message-----
From: WyvernGod@xxxxxxx [mailto:WyvernGod@xxxxxxx]
Sent: Monday, March 17, 2003 8:36 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: keys on 2 joined files?

Hello new guy here with a migraine starting problem

OK here is my problem.. i need to have a logical of 3 joined files ... the
contract master, client relation master, and the client master. the
problem
is the contract and client master bother have something i need to sort
with.
In contract i need the company code and employee location, then the client
name from client master, then the policy number from contract. every thing
i
try comes back in error and suggestions on how I can do this?  I'm trying
to
have these come out by name but in order for the program to work they myst
also be sorted by the employee location.

Thanks,
Chris
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