Tsql T-SQL在WITH语句中动态传递表名

我在T-SQL中有以下代码，可以从游标读取表名

但是我对

with

语句中的作用域表名称变量有问题

当我显式地将

dbo.@sys\u name

设置为类似

dbo.mysysnonym

的同义词名称时，我可以运行此代码，但当我将其作为变量名称设置为类似

dbo.@syn\u name

时，它不起作用

 -- drop duplicates records from synonyms
 DECLARE @syn_name varchar(50)

 DECLARE s_cursor CURSOR FOR  
     SELECT name 
     FROM sys.synonyms  
     WHERE  base_object_name LIKE 'xyz%'

 OPEN s_cursor;

 FETCH NEXT FROM s_cursor INTO @syn_name;

 WHILE @@FETCH_STATUS = 0
 BEGIN

     FETCH NEXT FROM s_cursor INTO @syn_name;

     WITH  dedupTable AS 
     (
         SELECT 
             sys_id, 
             row_number() OVER (PARTITION BY sys_id ORDER BY sys_id) AS nr
         FROM 
             dbo.@syn_name
     )
     DELETE  FROM dedupTable
     WHERE nr > 1
END;

CLOSE s_cursor
DEALLOCATE s_cursor

---

据我所知，您不能使用变量作为表名，因此

dbo.@syn_name

在

FROM

子句中不起作用。相反，您将不得不使用

比如：

...
FETCH NEXT FROM s_cursor INTO @syn_name;
DECLARE @sql nvarchar(4000)

SET @sql = N'
    WITH  dedupTable
    AS ( 
       SELECT sys_id, row_number() 
       OVER ( PARTITION BY sys_id ORDER BY sys_id  ) AS nr
       FROM dbo.' + @syn_name + '
    )
    DELETE  FROM dedupTable
    WHERE   nr > 1'

EXEC sp_executesql @sql