Hello!

В сообщении от Monday 24 November 2008 19:16:46 Constantine Vassil написал(а):
> OLAP functionality includes the concept of a sliding *window* that moves
> down
> through the input rows as they are processed. Additional calculations can
> be
>
> performed on the data in the window as it moves, allowing further analysis
> in a
> manner that is more efficient than using semantically equivalent self-join
> queries, or correlated subqueries.
>
> I am thinking this functionality is possible to implement working directly
> with
> the B-Tree.
>
> Does anyone has better ideas?

I think application-level solutions (R language for example) is better. I'm 
using safe tcl 
interpreter with custom functions and do send input data row by row to it.

Best regards, Alexey.
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