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Problem with calculated field in SSRS

Posted By:      Posted Date: October 04, 2010    Points: 0   Category :Sql Server
i have the foll scenario:
col1 col2 col3 col4 
A   1  100 
   2  250 150 
   3  500 250 
   4  600 100 
   5  900 300 

For col4 i need to calculate the difference b/w (the value in current row in col3 i.e. 250) - (the value in the previous row in col 3 i.e.100). i need to do that for all rows of col4. I need help with the expression to do this in SSRS.

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