动态视图管理查询

Question

我想sys.dm_exec_sql_text()在下面的查询中为 [sql_handle]应用表值函数。

SELECT  sql_handle
FROM    sys.dm_exec_query_stats A

对我来说，以下 2 个查询不起作用

Select  *,sys.dm_exec_sql_text(A.sql_handle)
from    sys.dm_exec_query_stats A 

Error:
Msg 4121, Level 16, State 1, Line 1
Cannot find either column "sys" or the user-defined function or aggregate "sys.dm_exec_sql_text", or the name is ambiguous.

Select  *
from sys.dm_exec_query_stats A,
sys.dm_exec_sql_text(A.sql_handle)

Error:
Msg 4104, Level 16, State 1, Line 3
The multi-part identifier "A.sql_handle" could not be bound.

Answer 1

你可以 CROSS APPLY :

...
from sys.dm_exec_query_stats A           
CROSS APPLY sys.dm_exec_sql_text(A.sql_handle)

就像微软的例子：

SELECT TOP 5 total_worker_time/execution_count AS [Avg CPU 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
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st
ORDER BY total_worker_time/execution_count DESC;