Re: SQL row processing order for UDF

Sorry, it's V5R3, Luis. :(

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"Some see the problem in every opportunity, some see the opportunity in
every problem."
-- Kevin Cowling

Dennis,

Which release is your system on?
Since V5R4 there exists the option of doing recursive SELECTs. Maybe
this
could used in solving your problem

Regards,

Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries


On Wed, Jun 16, 2010 at 12:19 PM, Dennis Lovelady
<iseries@xxxxxxxxxxxx>wrote:

Thanks, Alan:

The problem with that is that it masks the fact that the data are not
processed in the prescribed sequence. Apparently you've not been

following

this thread (no problem there), but it's critical that the rows be
*processed* in a particular sequence, rather than just *presented*

that

way.

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
I no longer need to punish, deceive or compromise myself. Unless, of
course,
I want to stay employed.

Hi Dennis
Try this
with t1 as (
select dept, name
from names
group by dept, name
)
select dept, name from t1
order by dept, name


Alan Shore
Programmer/Analyst, Direct Response
E:AShore@xxxxxxxx
P:(631) 200-5019
C:(631) 880-8640
"If you're going through Hell, keep going" - Winston Churchill




"Dennis Lovelady"
<iseries@lovelady
.com>
To
Sent by: "'Midrange Systems Technical
midrange-l-bounce Discussion'"
s@xxxxxxxxxxxx <midrange-l@xxxxxxxxxxxx>

cc

06/16/2010 12:18
Subject
PM RE: SQL row processing order

for

UDF

Please respond to
Midrange Systems
Technical
Discussion
<midrange-l@midra
nge.com>






Dang it, I'm back to square 1 on this.

This simple select:

with t1 as (
select dept, name
from names
group by dept, name
order by dept, name
)
select dept, name from t1

Produced these results at V5R3:

S&C TEMPLETON
EXEC DALY
IS KING
STAFF NESSON
OPER PINA
OPER GYAMFI
IS GOLBA

Is there really no way to tell SQL the order in which rows are to

be

processed?

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"I knew I was an unwanted baby when I saw that my bath toys were a
toaster and a radio."
-- Joan Rivers

I used to think CASE tools were oh so cool. Then RPG actually

started

getting improvements. And the CASE tool vendors thought

maintenance

money was reserved for paying off leveraged buy outs instead of
product improvements and they lagged behind, further and further,
until they fell into disuse.

Now I suppose SEQUEL is going that same route.


Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: "Dennis Lovelady" <iseries@xxxxxxxxxxxx>
To: "'Midrange Systems Technical Discussion'"
<midrange-l@xxxxxxxxxxxx>
Date: 06/16/2010 05:10 AM
Subject: RE: SQL row processing order for UDF
Sent by: midrange-l-bounces@xxxxxxxxxxxx



Thanks to all who responded. Rob's idea seems to fit the bill

best

in

this case.

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"Our vision is to speed up time, eventually eliminating it."
-- Alex Schure

Create a view with that statement. Access the view with SEQUEL?


Rob Berendt

Dennis
I didn't, but that's a very good idea.

However, it's not a complete solution since some uses of this,

against

my
fervent complaints, will be implemented using the SEQUEL

product,

which

has
no support for the WITH statement (among many other things).

Don't

get
me
started.

Any response to the "is it expected behavior" part?

Dennis Lovelady
http://www.linkedin.com/in/dennislovelady

--

Time is nature's way of keeping everything from happening at

once.

did you try to use an CTE?

With x as (Select TRNADAT, Amount
From MyTable
Where ...
Order By TRNDAT)
Select x.* MTD(Amount)

From x

;

Mit freundlichen Grüßen / Best regards

Birgitta Hauser

"Shoot for the moon, even if you miss, you'll land among the

stars."

(Les
Brown)
"If you think education is expensive, try ignorance." (Derek

Bok)

"What is worse than training your staff and losing them? Not

training

them
and keeping them!"

-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von

Dennis

Lovelady

Gesendet: Tuesday, 15. June 2010 15:30
An: 'Midrange Systems Technical Discussion'
Betreff: SQL row processing order for UDF

I created a UDF like a more complex version of this:

CREATE FUNCTION MTD(date, decimal(11,2)

RETURNS DECIMAL(13,2)

RETURNS NULL ON NULL INPUT

.

The select would like like:

SELECT TRNDATE, AMOUNT, MTD(AMOUNT)

ORDER BY TRNDATE



And ideally the result would be a running total of month-to-

date

values.

Pretty slick.



What I found, though, leads me to believe that the MTD

function

is

being called before the ORDER BY, and that's giving me wildly
incorrect results, even when the source table is already in

that

sequence. When the source table is already in the correct
sequence and I drop the ORDER BY, I
*seem*to* get the results that I want, but I doubt there's

any

guarantee of that; besides, that's a requirement that'll be

hard

to meet. So my two-part
question is: Is this expected behavior? Is there a way

around

this?

Dennis E. Lovelady
AIM/Skype: delovelady MSN: fastcounter@xxxxxxxxxxxx
<http://www.linkedin.com/in/dennislovelady>
www.linkedin.com/in/dennislovelady -- "A fanatic is one who

can't

change his mind and won't change the subject."
- Winston Churchill



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