Top expensive query in SQL Server

SELECT TOP 50 SUBSTRING(qt.text, (qs.statement_start_offset/2)+1,
   ((CASE qs.statement_end_offset WHEN -1 THEN DATALENGTH(qt.text)
		ELSE qs.statement_end_offset 
                    END - qs.statement_start_offset)/2)+1),
              qs.execution_count,
              qs.total_logical_reads,
              qs.last_logical_reads,
              qs.min_logical_reads,
              qs.max_logical_reads,
              qs.total_elapsed_time,
              qs.last_elapsed_time,
              qs.min_elapsed_time,
              qs.max_elapsed_time,
              qs.last_execution_time,
              qp.query_plan
FROM sys.dm_exec_query_stats qs CROSS APPLY 
        sys.dm_exec_sql_text(qs.sql_handle) 
	qt CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
	WHERE qt.encrypted=0
ORDER BY qs.total_logical_reads DESC

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