each value to subtract the last value

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  28.09.2009       2000          DB2

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  Published by: user7066552 on September 29, 2009 10:17

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    8       , db
    9       , row_number () over (partition by db, trunc (dt)
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  --------- ----- ---------- ----------
  27-SEP-09 DB2         1100       1050
  27-SEP-09 DB1          150        125
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