SQL Ranking (WAS) Sql retrieve first 10 rows

I'm looking into using this ranking stuff for the first time. I'm trying
to figure out if I can get the top restaurant for each region.

So in my table I have Region, Area, Restaurant, Sales

I'd like to get the top unit in sales for each region. Can I do that with
one statement?


Michael Schutte
Admin Professional
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midrange-l-bounces@xxxxxxxxxxxx wrote on 07/22/2008 10:53:07 AM:

Your statement would not work.

You are not using DENSE_RANK ( or RANK ) correctly. It makes no
sense to partition and order by the
same column when using DENSE_RANK() (or RANK) as you'll end up with
a rank of 1 for all rows.

Now if the OP was asking for the top 10 amounts by branch, then
DENSE_RANK (or RANK) would be the
correct function.

with tempTable ( BRANCH_CODE, AMOUNT, ROW_SEQ )
as ( select BRANCH_CODE,
AMOUNT,
dense_rank()
over (partition by BRANCH_CODE
order by AMOUNT desc)
as ROW_SEQ )
select * from tempTable where ROW_SEQ <= 10


However, in this case the OP just wanted the first 10 rows. Thus,
ROW_NUMBER() is the correct
function to use.




HTH,

Charles Wilt
--
Software Engineer
CINTAS Corporation - IT 92B
513.701.1307

wiltc@xxxxxxxxxx

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of John Taylor
Sent: Tuesday, July 22, 2008 10:31 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Sql retrieve first 10 rows

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
bounces@xxxxxxxxxxxx] On Behalf Of beppecosta

I have a table that contains 2 fields: branch code and amount.
Is is possible to exctract the first 10 rows for each branch ?
Thanks.

Look at the DENSE_RANK() feature available as of V5R4. The following

code

should get you started, but it's just off the top of my head, so hasn't
been
tested:


with tempTable ( BRANCH_CODE, AMOUNT, ROW_SEQ )

as ( select BRANCH_CODE,
AMOUNT,
dense_rank() over (partition by BRANCH_CODE order by
BRANCH_CODE)
as ROW_SEQ )

select * from tempTable where ROW_SEQ <= 10


Regards,

John Taylor



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