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average of difference between rows

Posted By:      Posted Date: September 06, 2010    Points: 0   Category :Sql Server
 
Hello, I need to calculate the difference between two rows and than find the average of those values. For example I have: date Value Value I need (difference between rows) 22.03.2010 50 30 24.01.2010 20 10 10.09.2009 10 NULL ----- 20 (which is the average of this column) Any suggestions? Thanx in advance :)


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