Chuck,
The goal is to convert existing DDS-defined DB objects to DDL. In my POC sampling, there is a Select/Omit logical file that I am trying to emulate using SQL.
After much trial and error, I managed to get the result set of properly ordered, properly selected data using a combination of a VIEW to limit the rows (the S/O criteria) and an INDEX to produce the order.
Now, before you all start to beat me about the head and shoulders, I know that this isn't a solution. My test is lucky to have the SQL Engine select the INDEX I wanted it to. But there is no way (to my knowledge) to force a particular INDEX selection by the engine.
But you said something that triggered something...I didn't think to add an INDEX using the WHERE clause, so I created an INDEX (after all, I'm trying to emulate a logical file). This was great...except that it returned only the columns listed in the key-expression. I had to use RCDFMT, name the format and indicate to use all columns.
CREATE INDEX NEEDLES/INDEX07 ON NEEDLES/TABLE (Fld1, Fld2)
where Fld4 = 'Y'
RCDFMT FORMAT ADD ALL COLUMNS
My thanks to all of you that chimed in!
Steve Needles
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of CRPence
Sent: Wednesday, June 05, 2013 12:42 PM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: Create view using CTE as to have an ORDER BY
On 05 Jun 2013 09:01, Needles,Stephen J wrote:
DRAT!! It was worth a try. Thanks all.
If anyone comes up with a solution, please advise!!
CREATE TABLE /* as Materialized Query Table (MQT) */ or DECLARE GLOBAL TEMPORARY TABLE can be used to create a /temporary/ table [as a more costly permanent object vs the true-temporary CTE] if the effect of a temporary copy of the [ordered] data has some specific value for other work [outside the scope of the query that might otherwise want to define its temporary table as a CTE].
Or if the goal was to use the VIEW in RLA vs an SQL SELECT query, then besides either of the above, one of the following might be useful:
- use a DDS LF with Select\Omit logic [optionally DYNSLT]
- use CREATE INDEX with a WHERE clause
- use OPNQRYF on the VIEW with a KEYFLD() specification, and share that ODP with the RLA program
--
Regards, Chuck
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