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Avg Question

Author

Topic

Mazdak
Yak Posting Veteran

63 Posts

Posted - 2005-11-27 : 04:24:15

For example I have 500 row , I want to get avg of each 5 field and put it in other table(only for the first 100 row) , it means I will have 20 new row to put in another table , how can I use Avg function in this case?

Thanks a lot

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2005-11-27 : 07:44:00

By creating a zero-based identity column you can group by the identityColumn / 5:


--create a table with an identity column
create table Junk (rowid int identity(0,1), objectid int)
go
--insert 500 rows
insert junk (objectid)
select distinct top 500 a.id from sysobjects a cross join sysobjects b
order by a.id
go

--avg every 5 row values of 1st 100 rows
select	convert(varchar,min(rowid)+1)+'-'+convert(varchar,max(rowid)+1)		[group]
	,count(*)								[numberAveraged]
	,avg(objectid)								[average]
from junk
where	rowid <100
group by rowid/5

go
drop table junk

Be One with the Optimizer
TG

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