sqlserver查询执行时间过长的sql

SELECT TOP 1000 
QS.creation_time 时间,
SUBSTRING(ST.text,(QS.statement_start_offset/2)+1,((CASE QS.statement_end_offset WHEN -1 THEN DATALENGTH(st.text) ELSE QS.statement_end_offset END - QS.statement_start_offset)/2)+1) AS 语句块,
ST.text as 语句,
QS.total_worker_time as 总执行时间毫秒,
QS.last_worker_time as 上次执行时间毫秒,
QS.max_worker_time as 最大执行时间毫秒,
QS.min_worker_time as 最小执行时间毫秒
FROM sys.dm_exec_query_stats QS
CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) ST
WHERE QS.creation_time BETWEEN convert(varchar(10),getdate(),23) AND convert(varchar(10),getdate()+1,23)
ORDER BY QS.total_worker_time DESC