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Berechnen Sie den laufenden Kontostand in der Oracle-Abfrage

Ich glaube, Sie wollen:

SELECT   B.NO_KLAIM AS id,
         a.amount AS amount_a,
         B.AMOUNT AS amount_b,
         a.amount - SUM (B.AMOUNT) 
                   OVER (partition by b.no_klaim ORDER BY B.cp_id ROWS UNBOUNDED PRECEDING)
              AS running_balance
FROM      TRX_TITIPAN A
           JOIN
              TRX_KLAIM_TITIPAN B
           ON A.NO_RESI_TITIPAN = B.NO_RESI_TITIPAN