常用方法

 

把表中的某个值连接起来

declare @str varchar(max)=''
select @str=@str+c.classname+'@' from A as c
select @str

 

查询SQL操作日志

SELECT     TOP 1000 QS.creation_time, 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 statement_text, ST.text, QS.total_worker_time, QS.last_worker_time, QS.max_worker_time, QS.min_worker_time
FROM         sys.dm_exec_query_stats QS CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) ST
WHERE   1=1  
--and QS.creation_time BETWEEN '2017-09-09 10:00:00' AND '2017-09-11 18:00:00' AND ST.text LIKE '%%'
ORDER BY QS.creation_time DESC