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Regardless of which approach, you will find it helpful to have an access
path sorted by date to make the rebuild of the logical file (or SQL
view/cursor) less painful.  Especially if it is a large file (which most
transactional files tend to be).

Of all the approaches that I've heard so far, aesthetically I like the Join
logical approach the best.  But, you may run into some performance issues if
this is a high volume file.  Also, you can't update a join logical file.

-Mike


-----Original Message-----
From: Rob Rogerson [mailto:rrogerson@xxxxxxxxxxxxxxxxx] 
Sent: Thursday, July 15, 2004 9:32 AM
To: 'System 21 Users'
Subject: RE: [SYSTEM21] Selecting a calculated date within a logical file.


I suggested using OPNQRY based on

Jon Wadey - 'What I am trying to achieve is to set-up a logical that will
only pick-up the previous days transactions.'

Since the previous day is always changing the selection criteria would be
ever changing as well.  Selection criteria in an OPNQRYF would accommodate
this.  Another solution would be to use SQL...

Robert A. Rogerson

-----Original Message-----
From: system21-bounces@xxxxxxxxxxxx [mailto:system21-bounces@xxxxxxxxxxxx]
On Behalf Of Brunk, Kevin
Sent: Thursday, July 15, 2004 9:15 AM
To: System 21 Users
Subject: RE: [SYSTEM21] Selecting a calculated date within a logical file.

Margaret,

I'm not sure I understand your solution.  There is no "select" parm on the
CRTLF command.  He'd have to write a program that would generate DDS source,
that would accept the parm you suggest, and insert it into the source, then
run the CRTLF command over this generated source.  Rob's solution using
OPNQRYF would work in concert with yours, since OPNQRYF allows the selection
criteria to be specified in the command.  But, if Jonathan is seeking a view
that persists beyond the life of the CL program, he couldn't use OPNQRYF.

==Kevin

-----Original Message-----
From: system21-bounces+kbrunk=wabutler.com@xxxxxxxxxxxx
[mailto:system21-bounces+kbrunk=wabutler.com@xxxxxxxxxxxx]On Behalf Of
mslayton@xxxxxxxxxxx
Sent: Thursday, July 15, 2004 8:49 AM
To: System 21 Users
Subject: Re: [SYSTEM21] Selecting a calculated date within a logical file.


If you are going to use CL to set up and run this job, there is another 
way.  You can create the logical file in the cl and pass it a parm for the
select part of the logical file,  and then delete the file when you get 
done with it. 
Thanks,  Margaret 



"Jonathan Wadey" <Jon_Wadey@xxxxxxxxxxxxxxxxxx> 
Sent by: system21-bounces@xxxxxxxxxxxx
07/15/2004 07:08 AM
Please respond to
System 21 Users <system21@xxxxxxxxxxxx>


To
system21@xxxxxxxxxxxx
cc

Subject
[SYSTEM21]   Selecting a calculated date within a logical file.






Dear All,

Is it possible, and if so does anybody know how, to do a file selection on a
date field within a logical file.

What I am trying to achieve is to set-up a logical that will only pick-up
the previous days transactions.

TIA

Jon





Jon_Wadey@xxxxxxxxxxxxxxx

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