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Rolling averages

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AskSQLTeam
Ask SQLTeam Question

0 Posts

Posted - 2001-12-07 : 09:32:19

David Mac writes "I'm looking for a way to calculate rolling averages. I assume that this could be done using cursors, but is there an easier way?

For example I have data in a table:


DATE     SCORE
1/1/01    20
2/1/01    30 
3/1/01    10
4/1/01    0

I want to return a recordset:


DATE    SCORE    AV
1/1/01    20     20  (20/1)
2/1/01    30     25  (20+25/2)
3/1/01    10     20   etc
4/1/01    0      15

The AV column is the average of the scores of all records up to and including the record in question. Easy to do in Excel!

The table is fairly large, so performance is a real issue.

thanks"

robvolk
Most Valuable Yak

15732 Posts

Posted - 2001-12-07 : 09:52:49

Have you seen this article yet:

http://www.sqlteam.com/item.asp?ItemID=3856

I'm pretty sure one of these techniques can be converted to use AVG() instead of SUM().

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