SELECT T1.FECHA, T2.VALOR
FROM TABLA T1
INNER JOIN (
SELECT T3.FECHA,
(
SELECT SUM(ISNULL(T4.VALOR,0))
FROM TABLA T4
WHERE T4.FECHA BETWEEN '2008-12-1' AND T4.FECHA
AND T3.FECHA >= T4.FECHA
) AS VALOR
FROM TABLA T3
WHERE T3.FECHA BETWEEN '2008-12-1' AND '2008-12-31'
) T2 ON T2.FECHA = T1.FECHA
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