代码是园子里找的：
SELECT TOP 20 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
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