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complex Select N query

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Topic

FR33D0M_F1GHTR
Starting Member

3 Posts

Posted - 2008-03-28 : 16:40:45

Ok, I have a table with two columns in the group by clause, ServerID and Database ID. I have 9 unique ServierIDs and 117 unique DatabaseIDs. I need a query that says gimme the 5 highest database id hitcount totals for each server id. I would like to do this without a #temp table or a cursor.
here's what I have:

-------------------------------------------------------------------
create table #server_hitcount_summary(
SID int not null,
DBID int not null,
ORD int not null,
SUM_HITCOUNT bigint not null,
SUM_MAXWRITES bigint not null,
SUM_MAXREADS bigint not null,
SUM_MAX_DURATION bigint not null,
SUM_MAX_CPU bigint not null
)

declare @id int
set @id = 1
while (@id < 20)
begin
insert #server_hitcount_summary
select top (@top)
SID,
DBID,
ROW_NUMBER() over (order by sum(hitcount) desc) as ORD,
sum(hitcount) as SUM_HITCOUNT,
sum(MAX_WRITES) as SUM_MAXWRITES,
sum(MAX_READS) as SUM_MAXREADS,
sum(MAX_DURATION) as SUM_MAX_DURATION,
max(max_cpu) as MAX_MAX_CPU
from
hitcounts_table group by SID, DBID having SID = @id and DBID <> 1 order by sum_HITCOUNT desc
set @id = @id + 1
end
select
SID,
DBID,
ORD,
SUM_HITCOUNT,
SUM_MAXWRITES,
SUM_MAXREADS ,
SUM_MAX_DURATION,
SUM_MAX_CPU
from #server_hitcount_summary order by SID asc
drop table #server_hitcount_summary
-------------------------------------------------------------------

What d'ya think? is there a better way to do this?

-The Universe is naturally cold. It takes the power of a star to change that.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-03-29 : 02:07:37

Hope this is what you're looking for:-

SELECT * FROM
(SELECT ROW_NUMBER() OVER(PARTITION BY t.SID GROUP BY SUM_HITCOUNT DESC) AS RowNo,
*
FROM
(select 
SID, 
DBID, 
sum(hitcount) as SUM_HITCOUNT, 
sum(MAX_WRITES) as SUM_MAXWRITES, 
sum(MAX_READS) as SUM_MAXREADS, 
sum(MAX_DURATION) as SUM_MAX_DURATION,
max(max_cpu) as MAX_MAX_CPU
from 
hitcounts_table group by SID, DBID 
having SID = @id and DBID <> 1 )t
)t1
WHERE t1.RowNo<=5

FR33D0M_F1GHTR
Starting Member

3 Posts

Posted - 2008-03-31 : 11:45:44

thanks. That works.

-The Universe is naturally cold. It takes the power of a star to change that.

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