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  1.  Home
  2. RPG400-L
  3. November 2006

Re: Can this be done in SQL instead of traditional 'CHAIN'?

Birgitta,
I appreciate your assistance. I am a tad bewildered though. This the query
that I am using and I am not grouping by prcuom but still getting both the
uom's. I think the reason is because there are two numbers coming out of
price field and two 'CS' and '99' coming out of uom field. Hmm...Any
thoughts?

 With x as (Select ITMNUM as xItemNo, Max(DTEEFF) as xMyDate
           from ec30data.ITMPRC
           where IBBRCH = ' ' and PRCUOM = 'CS'
           Group By ITMNUM)
 Select a.*
 from ec30data.ITMPRC a join x on ITMNUM = xItemNo and DTEEFF = xMyDate;



Thanks again,

cheers.

Jake.




On 11/3/06, HauserBirgitta <Hauser@xxxxxxxxxxxxxxx> wrote:


Hi Jake,

just have a look at the example I changed. I not only added the where
condition, but also removed the case statement and the column PRCUOM from
the CTE.
You had a group by clause on ItemNo and PRCUOM. In this way you'll get two
rows, one for each PRCUOM.

Mit freunlichen 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)




----- Original Message -----
From: "Jake M" <jakeroc@xxxxxxxxx>
To: "RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
Sent: Friday, November 03, 2006 20:48
Subject: Re: Can this be done in SQL instead of traditional 'CHAIN'?


Birgitta,
That is exactly what I thought and also tried adding PRCUOM = 'CS' but
doing
this is still showing item 'b' two times with PRCUOM as '99' in one record
and 'CS' in one record. Am I missing something here? Thanks again for your
assistance.

cheers,

Jake.

On 11/3/06, HauserBirgitta <Hauser@xxxxxxxxxxxxxxx> wrote:
>
> Hi,
>
> >>I have another field named 'PRCUOM' now an item may have 'CS' or '99'
> what
> >>if I want to select only items with 'CS'...So, for item 'b', I want to
> see
> >>only one record...
>
> ... just add a where condition to the CTE:
>   With x as (Select ITMNUM as xItemNo, Max(DTEEFF) as xMyDate,
>                from ec30data.ITMPRC
>                where     IBBRCH = ' '
>                      and PRCUCOM = 'CS'
>             Group By ITMNUM)
> Select a.*
> from    ec30data.ITMPRC a join x
>       on ITMNUM = xItemNo and DTEEFF = xMyDate and PRCUOM = xprcuom;
>
> Just an other comment:
> A Select-Statement is not restricted to a single CTE, i.e. you can
define
> as
> much as you want (there may be a restriction at 256? CTEs).
> And it's even possible to use a CTE in an other CTE.
> In the following example the ItemNo with the highest Sales (including
the
> total sales) will be determined.
> Example:
> with a as (select ItemNo as aItemNo, sum(Sales) as SalesPerItem
>                      from Sales
>                      group by ItemNo),
>      b as (Select Max(SalesPerItem) as MaxSales from a)
> select a.*
>    from a join b on SalesPerItem = MaxSales ;
>
> Mit freunlichen 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)
>
>
>
>
> ----- Original Message -----
> From: "Jake M" <jakeroc@xxxxxxxxx>
> To: "RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
> Sent: Friday, November 03, 2006 18:45
> Subject: Re: Can this be done in SQL instead of traditional 'CHAIN'?
>
>
> I appreciate and thank you all for all the suggestions.
> Birgitta,
> Thanks a bunch for the CTE suggestion. It helped out a great deal. I am
> almost through but for a small problem. What if I want to throw in
another
> parameter?
>
> I have another field named 'PRCUOM' now an item may have 'CS' or '99'
what
> if I want to select only items with 'CS'...So, for item 'b', I want to
see
> only one record...
> b     ''        20060712      59.46
>
> This is where I am at..
>
>   With x as (Select ITMNUM as xItemNo, Max(DTEEFF) as xMyDate, PRCUOM as
> xprcuom,
>             CASE WHEN (PRCUOM = 'CS' or PRCUOM = 'EA')
>             THEN PRCUOM = 'CS'
>             ELSE PRCUOM
>             END
>             from ec30data.ITMPRC
>             where IBBRCH = ' '
>             Group By ITMNUM, PRCUOM)
> Select a.*
> from ec30data.ITMPRC a join x on ITMNUM = xItemNo
> and DTEEFF = xMyDate and PRCUOM = xprcuom;
>
> data
> ===
> item      branch  dateeff                 price      prcuom
> a               1     20060108             15.18     bg
> a               3     20060108             38.16     cs
> a               2     20060509             48.15     cs
> a                      20061015             39.12     99
>
> b               4     20060915             48.36      di
> b               3     20060101             99.12      lm
> b                      20060712             59.46      cs
> b               2     20051225             74.69      cs
> b                      20060712             18.45      99
>
> c               1     20050815             10.15      cs
> c                      20061012             19.04      99
> c               3     20061030             18.77      cs
>
> d               6     20051215              0.79       di
> d               7     20061010             19.65      pr
> d                      20061015             44.22      im
> d               2     20050512             33.98      pr
>
> once again, thanks for all the suggestions. I appciate the help.
>
> cheers,
>
> Jake.
>
>
>
>
>
>
> On 11/3/06, HauserBirgitta <Hauser@xxxxxxxxxxxxxxx> wrote:
> >
> > Hi,
> >
> > instead of a sub-subselect also a common table expression (CTE). A CTE
> is
> > nothing else than a temporary view, that is only valid for the
> > select-statement where specified. IMHO CTEs are more readeable than
> nested
> > subselects.
> >
> > With x as (Select ItemNo as xItemNo, Max(MyDate) as xMyDate
> >              from MyTable
> >              where branch = ' '
> >              Group By ItemNo)
> > Select a.*
> >    from MyTable a join x on    ItemNo = xItemNo
> >                             and MyDate = xMyDate;
> >
> >
> > Mit freunlichen 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)
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "David Keck" <DavidKeck@xxxxxxxx>
> > To: "RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
> > Sent: Thursday, November 02, 2006 23:55
> > Subject: Re: Can this be done in SQL instead of traditional 'CHAIN'?
> >
> >
> >
> > You could try working in something along the lines of the code shown
> > below.
> > Maybe better is to build a work file (in advance of running your
> > application) which has only one price record per item.  BTW, your boss
> > might be able to code this application rather quickly using "CHAIN"
;-)
> >
> > select p.price
> >       from Item i left join ItemPrice p
> >       on i.item = p.item
> >       where p.branch = ' ' and
> >             p.date = (select max(x.date) from ItemPrice x
> >                         where x.item = i.item and
> >                               x.branch = ' ')
> >
> > David Keck
> > NBTY, Inc
> > Phone (631) 200-5809
> > DavidKeck@xxxxxxxx
> >
> >
> >
> > Hello All;
> > I am working on an embedded SQL code instead of using the traditional
> > 'CHAIN' suggested by my boss. Now, I am stuck and was wondering if
> anybody
> > could point me in the right direction. I am dabbling in quite a few
> files
> > but I will try and keep it very relevant. Firstly, here is a little
> subset
> > of the data.
> >
> >    item branch dateeff price  a 1 20060108 15.18  a 3 20060108 38.16
  a
> 2
> > 20060509 48.15  a
> > 20061015 39.12  b 4 20060915 48.36  b 3 20060101 99.12  b
> > 20060710 59.46  b 2 20051225 74.69  b
> > 20051012 18.45  c 1 20050815 10.15  c
> > 20061012 19.04  c 3 20061030 18.77  d 6 20051215 0.79  d 7 20061010
> 19.65
> > d
> > 20061015 44.22  d 2 20050512 33.98
> > Now, here is my difficulty. I am going to join the item later on with
my
> > grand query. From this file this is what I need...
> > If I pick up an item 'a' I want my query to give the price with the
> latest
> > date in 'dateeff' and the 'branch' needs to be blank. So, for item 'a'
> it
> > would be '39.12'. That is too trivial. Now, if I want the pricing for
> 'b'
> > the latest date is 20060915 but the branch is not blank so I need to
> look
> > the next latest date and see if the branch associated with that date
is
> > blank and if it then I need to pick that pricing. So, it is 59.46. For
> > item
> > 'c', it is 19.04. For item 'd' it is 44.22.
> >
> > I hope I have made sense out of my problem. I have been working on
this
> > for
> > the past four hours but to no avail. This is my whole query till
> > now....(if
> > anybody wants to make sense out of it..:-0))
> >
> > (My apologies for non-formatted SQL)...
> >
> > select itmmst.itmnum, itmdsc, unit, vendor, itmlgm,
> REPLACE(substr(nccxpp,
> > 9, 50), '@', ':') AS $$PATH40, desc, shortdescription, price, dteeff
> from
> > (select max(dteeff) as max_date, itmnum from ec30data.itmprc group by
> > itmnum) maxresults, ec30data.itmmst itmmst left outer join
> > ec30data.bwixrfbwixrf on
> > itmmst.itmlgm = bwixrf.nccxcn left outer join testing.catview catview
on
> > itmmst.itmnum = catview.itmnum left outer join ec30data.itmprc itmprc
on
> > itmmst.itmnum = itmprc.itmnum WHERE (maxresults.max_date =
itmprc.dteeff
> > and
> > itmprc.itmnum = maxresults.itmnum)
> >
> > Any help in this matter would be much appreciated.
> >
> > Thanks in advance.
> >
> > cheers,
> >
> > Jake.
> > --
> > This is the RPG programming on the AS400 / iSeries (RPG400-L) mailing
> list
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> > at http://archive.midrange.com/rpg400-l.
> >
> >
> >
> >
> >
> >
>
--------------------------------------------------------------------------------
> >
> >
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> > >
> >
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