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Sorting on column take time while using Row_number()

Posted By:      Posted Date: December 04, 2010    Points: 0   Category :ASP.Net

when I use 'RowNumber' = ROW_NUMBER() OVER(ORDER BY ColumnName)  then due to orderby Column name consume 76% usage. in such case what I have to do? I can see sorting taking much time in execution plan. 

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