sqlserver 选出占用cpu的sql语句

SELECT TOP 10
     total_worker_time/execution_count AS avg_cpu_cost, plan_handle,
     execution_count,
     (SELECT SUBSTRING(text, statement_start_offset/2 + 1,
        (CASE WHEN statement_end_offset = -1
           THEN LEN(CONVERT(nvarchar(max), text)) * 2
           ELSE statement_end_offset
        END - statement_start_offset)/2)
     FROM sys.dm_exec_sql_text(sql_handle)) AS query_text
 FROM sys.dm_exec_query_stats
 ORDER BY [avg_cpu_cost] DESC