Re: Another SQL Question

[Jeff Young <cooljeff913@xxxxxxxxx>]

Thanks Brigitta,
I used the Dense_Rank and it worked fine.
I have another question:
Given the SQL Statement:
Select Distinct Gl_Year,Gl_Period,              
Dense_Rank() Over(Order by Gl_year,Gl_Period)   
       From Control_Xref                        
I get the following error:
                                                                                
 Message ID . . . . . . :   SQL0214                                             
                                                                                
                                                                                
 Message . . . . :   ORDER BY expression is not valid.                          
                                                                                
 Cause . . . . . :   The expression in the ORDER BY clause in position 1 is not 
   valid for reason code 2.                                                     
     1 - The SELECT statement contains a UNION, EXCEPT, or INTERSECT.           
     2 - DISTINCT is specified in the SELECT clause and the expression or       
   column cannot be matched exactly with an expression or column in the select  
   list.                                                                        

The field names GL_Year and Gl_Period are in the Control_Xerf file.

Thanks,

Jeff Young 
Sr. Programmer Analyst
IBM -e(logo) server Certified Systems Exper - iSeries Technical Solutions V5R2 
IBM  Certified Specialist- e(logo) server i5Series Technical Solutions Designer V5R3
IBM  Certified Specialist- e(logo)server i5Series Technical Solutions Implementer V5R3 


  
 





----- Original Message ----
From: BirgittaHauser <Hauser@xxxxxxxxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Sent: Friday, May 2, 2008 1:04:58 PM
Subject: AW: AW: Another SQL Question

Hi,

With Row_Number you won't get duplicates, i.e. each row gets ist own
counter.
With Dense_Rank you can have several first "places", several second "places"
etc.
As far as I have understood, he wanted to have the same number for all rows
with the same fiscal year, group and source code. That's why I used
Dense_Rank instead of Row_Number.
But there is an other OLAP ranking function, RANK().
Like DENSE_RANK duplicates are allowed, but if there are 2 first places, the
next counter will be 3.

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 Joe Pluta
Gesendet: Friday, May 02, 2008 18:27
An: Midrange Systems Technical Discussion
Betreff: Re: AW: Another SQL Question


BirgittaHauser wrote:
> Hi,
>
> If you are already on release V5R4, you may use the OLAP-Ranking 
> function DENSE_RANK.
>  
Birgitta, what's the difference in layman's terms between ROW_NUMBER and 
DENSE_RANK?