Expression for Average of the Largest 40 in a series

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Expression for Average of the Largest 40 in a series

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AskSQLTeam
Ask SQLTeam Question

0 Posts

Posted - 2006-08-11 : 08:39:37

Eric writes "Please help me with an SQL equation that will look at a large series of numbers (hundreds) and return the average of the largest 40 numbers in that series.

Thanks for the help! "

robvolk
Most Valuable Yak

15732 Posts

Posted - 2006-08-11 : 08:43:21

Hmmmm. Kinda smells like homework, but I'll bite:

SELECT Avg(num) FROM (SELECT TOP 40 num FROM myTable ORDER BY num DESC) a

Depending on how you want to handle duplicate values, you may need to use:

SELECT Avg(num) FROM (SELECT TOP 40 WITH TIES num FROM myTable ORDER BY num DESC) a

Or, if you want the average of the distinct values:

SELECT Avg(num) FROM (SELECT DISTINCT TOP 40 num FROM myTable ORDER BY num DESC) a

druer
Constraint Violating Yak Guru

314 Posts

Posted - 2006-08-11 : 08:43:56

select avg(select top 40 field_value from table order by field_value DESC) as Avg_For_Top_40

Hope it helps,
Dalton

Blessings aren't so much a matter of "if they come" but "are you noticing them."

DonAtWork
Master Smack Fu Yak Hacker

2167 Posts

Posted - 2006-08-11 : 11:40:14

Kapow!

For fast help, follow this link:
http://weblogs.sqlteam.com/brettk/archive/2005/05/25.aspx

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