RE: Derived Index V6R1

FYI, TIMESTAMP_FORMAT cannot be used when creating a derived index.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of CRPence
Sent: Tuesday, August 30, 2011 11:03 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: Derived Index V6R1

On 30-Aug-2011 06:25 , Schutte, Michael D wrote:

Looking for a best solution for implementing and using derived index.
I have a table that has a date in it MMDDYYYY format. It's a large
historical file that we often fight with getting data from. I would
like to create this derived index with the date as YYYYMMDD...

create index mylib/r06_derived on mylib/sales
( company
, dec(substr(digits(dcodte),5,4) concat
substr(digits(dcodte),3,2) concat
substr(digits(dcodte),1,2), 8, 0) as dtyyymmdd
)

Not sure why the additional DEC casting would be desirable, since
that just makes the expression even more verbose.?

This creates just fine. My question is how to use it.

Personally I would hate to duplicate "company = ? and
dec(substr(digits(dcodte),5,4) concat
substr(digits(dcodte),3,2) concat
substr(digits(dcodte),1,2), 8, 0) between ? and ?"
in every SQL statement I write to use the derived index.

I could create a view over the physical file that does cast dcodte
to the format I want, then I can select from the view using the new
field. Ideally, I would be able to use a UDF (not supported).

The following expression(s) might be more succinct [¿and functional?]
alternatives. And the two expressions will have the benefit [or
difficulty] of requiring a date\time[stamp] data type for the predicate
instead of the decimal data type used in the quoted example:

TIMESTAMP_FORMAT(DIGITS(dcodte), 'MMDDYYYY')

DATE( TIMESTAMP_FORMAT(DIGITS(dcodte), 'MMDDYYYY') )

<<SNIP UDT ref\question>>

Regards, Chuck
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.

________________________________

Notice from Bob Evans Farms, Inc: This e-mail message, including any attachments, may contain confidential information that is intended only for the person or entity to which it is addressed. Any unauthorized review, use, disclosure or distribution is strictly prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message and any attachments.