不透明列时出现类型转换错误，为什么？

Question

我试图UNPIVOT mdsb.sys.database表中的某些列，但有一些列的问题。我尝试在将UNPIVOTing表格中的所有列CAST到CTE中的NVARCHAR（128），但它仍然无效。有人可以解释为什么以及如何解决问题？

; 
WITH props AS (
SELECT 
    [name] 
    ,CAST([collation_name] AS NVARCHAR(128)) AS [collation_name] 
    ,CAST([is_auto_close_on] AS NVARCHAR(128)) AS [is_auto_close_on] 
    ,CAST([is_auto_shrink_on] AS NVARCHAR(128)) AS [is_auto_shrink_on] 
    ,CAST([is_auto_create_stats_on] AS NVARCHAR(128)) AS [is_auto_create_stats_on] 
    ,CAST([is_auto_update_stats_async_on] AS NVARCHAR(128)) AS [is_auto_update_stats_async_on] 
    ,CAST([is_auto_update_stats_on] AS NVARCHAR(128)) AS [is_auto_update_stats_on] 
    ,CAST(CASE WHEN [is_parameterization_forced] = 0 THEN N'SIMPLE' ELSE N'FORCED' END AS NVARCHAR(128)) AS [is_parameterization_forced] 
    ,CAST([is_trustworthy_on] AS NVARCHAR(128)) AS [is_trustworthy_on] 
    ,CAST([compatibility_level] AS NVARCHAR(128)) AS [compatibility_level] 
    ,CAST([page_verify_option_desc] AS NVARCHAR(128)) AS [page_verify_option_desc] 
FROM sys.databases s 
WHERE [name] = DB_NAME() 
) 
SELECT [name] 
     ,[property] 
     ,[value] 
FROM [props] 
UNPIVOT 
(
    [value] 
    FOR [property] IN ([collation_name] 
         ,[is_auto_close_on] 
         ,[is_auto_shrink_on] 
         ,[is_auto_create_stats_on] 
         ,[is_auto_update_stats_async_on] 
         ,[is_auto_update_stats_on] 
         ,[is_parameterization_forced] 
         ,[is_trustworthy_on] 
         ,[compatibility_level] 
         ,[page_verify_option_desc] 
         ) 
) AS u 

错误：

Msg 8167, Level 16, State 1, Line 34 
The type of column "page_verify_option_desc" conflicts with the type of other columns specified in the UNPIVOT list. 

结果应该是这个样子，但与 “page_verify_option_desc” 行 “recovery_model_desc”。

name property value 
master collation_name SQL_Latin1_General_CP1_CI_AS 
master is_auto_close_on 0 
master is_auto_shrink_on 0 
master is_auto_create_stats_on 1 
master is_auto_update_stats_async_on 0 
master is_auto_update_stats_on 1 
master is_parameterization_forced SIMPLE 
master is_trustworthy_on 0 
master compatibility_level 110 

Answer 1

我认为它实际上是一个整理问题

尝试这样

; 
WITH props AS (
SELECT 
    [name] 
    ,CAST([collation_name] AS NVARCHAR(128)) AS [collation_name] 
    ,CAST([is_auto_close_on] AS NVARCHAR(128)) AS [is_auto_close_on] 
    ,CAST([is_auto_shrink_on] AS NVARCHAR(128)) AS [is_auto_shrink_on] 
    ,CAST([is_auto_create_stats_on] AS NVARCHAR(128)) AS [is_auto_create_stats_on] 
    ,CAST([is_auto_update_stats_async_on] AS NVARCHAR(128)) AS [is_auto_update_stats_async_on] 
    ,CAST([is_auto_update_stats_on] AS NVARCHAR(128)) AS [is_auto_update_stats_on] 
    ,CAST(CASE WHEN [is_parameterization_forced] = 0 THEN N'SIMPLE' ELSE N'FORCED' END AS NVARCHAR(128)) AS [is_parameterization_forced] 
    ,CAST([is_trustworthy_on] AS NVARCHAR(128)) AS [is_trustworthy_on] 
    ,CAST([compatibility_level] AS NVARCHAR(128)) AS [compatibility_level] 
    ,CAST([page_verify_option_desc] collate database_default AS NVARCHAR(128)) AS [page_verify_option_desc] 
FROM sys.databases s 
WHERE [name] = DB_NAME() 
) 
SELECT [name] 
     ,[property] 
     ,[value] 
FROM [props] 
UNPIVOT 
(
    [value] 
    FOR [property] IN ([collation_name] 
         ,[is_auto_close_on] 
         ,[is_auto_shrink_on] 
         ,[is_auto_create_stats_on] 
         ,[is_auto_update_stats_async_on] 
         ,[is_auto_update_stats_on] 
         ,[is_parameterization_forced] 
         ,[is_trustworthy_on] 
         ,[compatibility_level] 
         ,[page_verify_option_desc] 
         ) 
) AS u