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

["Jake M" <jakeroc@xxxxxxxxx>]

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.
> --
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