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Message Posted: Wed, 06 Mar 2013 @ 08:24:44 GMT

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Not really, you should have used some non-ascending values for your example data :-)

If you actually need the median of *three* values there's a simple solution, the median is the sum minus the min and the max:

     CASE
        ROW_NUMBER() OVER (ORDER BY Month_Dt)
        WHEN 1 THEN NULL
        WHEN 2 THEN SUM(Amount) OVER (ORDER BY Month_Dt ROWS 2 PRECEDING)
                   -MAX(Amount) OVER (ORDER BY Month_Dt ROWS 2 PRECEDING)
        ELSE        SUM(Amount) OVER (ORDER BY Month_Dt ROWS 2 PRECEDING)
                   -MAX(Amount) OVER (ORDER BY Month_Dt ROWS 2 PRECEDING)
                   -MIN(Amount) OVER (ORDER BY Month_Dt ROWS 2 PRECEDING) END

Otherwise you probably have to keep your solution

Dieter

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