Fetch n rows from each group by.

I have used the FETCH n ROWS ONLY clause to return the first n records
in a select statement, but I now want to return the first n from each
group, and I'm damned if I can find any reference material for this. Can
it be done?

 

In essence I want to return the top 5 agents from each region based on
sales. The following pseudo-SQL would show all the agents in reverse
sales order within region:

 

Select region, sales from file order by region, sales desc

 

If I want to select the first 5 in the entire return set I use:

 

Select region, sales from file order by region, sales desc fetch first 5
rows only

 

How do I write the SQL to return only the first 5 in each region without
having to use RPG?

 

TIA

 


*********************************************************************************************************
This email and any files transmitted with it are confidential and intended 
solely for the use of the individual or entity to whom they are addressed. If 
you are not the intended recipient, any use, disclosure or copying of this 
message is unauthorised. If you have received this message in error, please 
reply using the sender's email address. 

This footnote confirms that this email message has been scanned for computer 
viruses. EIG-Ansvar Limited does not accept liability for any loss or damage, 
whether caused by our own negligence or not, that results from a computer virus 
or defect in the transmission of this email or any attached file. 

EIG-Ansvar Limited - Australia (A.B.N. 21 007 216 506)
Email : insure@xxxxxxxxxxxxxxxx

Eig-Ansvar Limited - New Zealand
Email : insure@xxxxxxxxxxxxxxxx

*********************************************************************************************************