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Message Posted: Tue, 22 Feb 2005 @ 14:19:18 GMT

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Subj:   Re: Finding previous record puzzle
From:   Wayne Schachtel

Try using the MDIFF (x,w,y) or SUM (preferred) functions:

     MDIFF (value_expression, width, sort_expression_list)


     X - SUM( X ) over (order by Y rows between W preceding and W preceding)

Wayne Schachtel
Wayne Schachtel Consulting

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