Re: Stuck With Analytic Function

Michel Cadot wrote:

> <pankaj_wolfhunter_at_yahoo.co.in> a écrit dans le message de news: 1161152101.294926.7750_at_m7g2000cwm.googlegroups.com...
>
> Michel Cadot wrote:
>
> > <pankaj_wolfhunter_at_yahoo.co.in> a écrit dans le message de news: 1161075086.591935.160320_at_m73g2000cwd.googlegroups.com...
> > | Greetings,
> > | I have a table structure and values as (TABLE1: dummy)
> > |
> > | REF_NO SYMBOL ID EXEC_NAME
> > | --------- -------------------- ---------- --------------------
> > | 1 AA 123 DL
> > | 1 AA 123 RR
> > | 2 BB 133 DL
> > |
> > | I want to rank these records based on exec_name.
> > |
> > | What I want is, if for a particular ID there is an EXEC_NAME
> > | IN('RR','RK) then that record should
> > | be ranked as 1 and others can be ranked accordingly.
> > |
> > | So I want the output as such
> > |
> > | REF_NO SYMBOL ID EXEC_NAME
> > | RANK
> > | --------- -------------------- ---------- --------------------
> > | ----------
> > | 1 AA 123 DL
> > | 2
> > | 1 AA 123 RR
> > | 1
> > | 2 BB 133 DL
> > | 1
> > |
> > | So far I am just able to get the rank to each record based on ID
> > | (without EXEC_NAME condition).
> > |
> > | SELECT REF_NO, SYMBOL, ID, EXEC_NAME, RANK
> > | FROM (SELECT REF_NO, SYMBOL, ID, EXEC_NAME, ROW_NUMBER() OVER(PARTITION
> > | BY ID ORDER BY EXEC_NAME
> > | FROM TABLE1)
> > |
> > |
> > | REF_NO SYMBOL ID EXEC_NAME
> > | RANK
> > | --------- -------------------- ---------- --------------------
> > | ----------
> > | 1 AA 123 DL
> > | 1
> > | 1 AA 123 RR
> > | 2
> > | 2 BB 133 DL
> > | 1
> > |
> > | How should I modify this to acquire the desired result?
> > |
> > | Any help would be appreciated
> > |
> > | TIA
> > |
> > | DB Version Information:
> > |
> > | Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
> > | PL/SQL Release 10.2.0.1.0 - Production
> > |
> >
> > Use a DECODE/CASE in your ORDER BY clause to make RR/RK appear in first.
> > Use RANK() function instead of ROW_NUMBER() if you want a... rank.
> > It is useless to use a subquery.
> >
> > Regards
> > Michel Cadot
>
> Thanks Michael.
> Actually in my case ROW_NUMBER will work fine cause I just want to
> assign sr.no's to group of records.
> I'll be more glad if u can help me in preparing my DECODE function
> here.
> I am unable to construct the same.
> I mean how can I make records with RR/RK to appear first in order and
> then apply the ROW_NUMBER
> analytic function on that?
>
> --------------------------------------
>
> "order by case when exec_name in ('RR','RK') then chr(0) else exec_name end"
> then RR and RK will always appears first.
>
> What if you have RR and RK at the same time, or duplicate exec_name?
> This is why I think rank or dense_rank _may_ be better, depending on
> what rank value you want in these cases.
>
> Regards
> Michel Cadot

Thanks Michael, tht was beautiful and worked as required. Also as u suggested, the subquery used was also removed. Even I had the doubt what if both RR and RK appears at the same time. The reason I went for this was, till now's data available, this was never been a case
but I asked my superior and he still needs to get back on this. Thanks for the help. Received on Wed Oct 18 2006 - 11:08:58 CDT