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Message Posted: Mon, 10 Mar 2008 @ 23:15:23 GMT

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just use CASE:

     ,CASE WHEN amt IS NULL THEN 0 ELSE
         SUM(amt) OVER (PARTITION BY s.customer_id
              ORDER BY s.transid ASC
              ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
       END

Dieter

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