RE: Sorting -- MIDRANGE-L

Back in the old days on the System/38, before OPNQRYF, we used a utility
which would create a source file in QTEMP, write records to it to define a
logical file, and then create the logical file in QTEMP. It had a command
interface and you passed it the name of the physical file, the keys fields
you wanted to use, and the name of the physical file. 

Since logical files allow substringing (and sorting on substringed fields)
it sounds like something like that might work for you.

Albert York                          


        -----Original Message-----
        From:   DeLong, Eric [SMTP:EDeLong@xxxxxxxxxxxxxxx]
        Sent:   Wednesday, April 30, 2003 2:31 PM
        To:     'Midrange Systems Technical Discussion'
        Subject:        RE: Sorting

        SQL has pretty much been ruled out because:

        1) the source data is non-described (flat file)
        2) it's not possible to create an index on a derived field
(substring)

        Eric DeLong
        Sally Beauty Company
        MIS-Project Manager (BSG)
        940-898-7863 or ext. 1863



        -----Original Message-----
        From: Jim Franz [mailto:franz400@xxxxxxxxxxxx]
        Sent: Wednesday, April 30, 2003 4:24 PM
        To: Midrange Systems Technical Discussion
        Subject: Re: Sorting


        you can substring in sql selects.
        jim

        ----- Original Message -----
        From: "Metz, Zak" <Zak_Metz@xxxxxx>
        To: "Midrange Systems Technical Discussion"
<midrange-l@xxxxxxxxxxxx>
        Sent: Wednesday, April 30, 2003 4:42 PM
        Subject: RE: Sorting


        > There I go mixing up DDS LFs with SQL views...but they look the
same
        > when I WRKOBJ! Yeah, it is indeed a "flat" file. So that pretty
much
        > eliminates SQL, except if I can deal with duplicating all the data
to a
        > second file, in which case I can do all the substringing I need.
OPNQRYF
        > is starting to look better, and yeah, my only problem with that is
        > getting all the quotes straight, but I've managed before. QMQRY
seems to
        > have the advantage of being able to write over the same PF, as
does the
        > QLGSORT API, the most recent suggestion from Tom.
        >
        > Thanks for helping me hash this out, Eric.
        >
        > > -----Original Message-----
        > > From: DeLong, Eric
        > >
        > > Uh, I don't think a view will work for the KEYFILE part....
        > > That parm refers
        > > to the access path to for the reordering of the PF data.  A
        > > view by itself
        > > has no access path, and I don't think SQL allows you to use
        > > derived fields
        > > as indexes..... :(
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