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  • 动态表名的查询SQL

    CREATE TABLE [dbo].[TB_User](
     [ID] [int] NOT NULL,
     [Name] [varchar](50) NOT NULL,
     [Score] [varchar](50) NULL,
     ) ON [PRIMARY]

    INSERT INTO [dbo].[TB_User]
       ([ID],[Name] ,[Score])
     VALUES (1,'Lucy','');
    INSERT INTO [dbo].[TB_User]
       ([ID],[Name] ,[Score])
     VALUES (1,'Lili','');
    INSERT INTO [dbo].[TB_User]
       ([ID],[Name] ,[Score])
     VALUES (1,'Jack','');


    declare @exesql nvarchar(1000);
    declare @table varchar(50);
    set @table='TB_User';
    set @exesql='SELECT *  FROM [dbo].'+@table;
    execute sp_executesql @exesql

    declare @exesql nvarchar(1000);
    declare @table varchar(50);
    set @table='TB_User';
    set @exesql='update [dbo].'+@table+' set Score=''Good''';
    execute sp_executesql @exesql


    过程 sp_executesql,参数类型必须为 'ntext/nchar/nvarchar'


    另外的例子:

    DECLARE @IntVariable int;
    DECLARE @SQLString nvarchar(500);
    DECLARE @ParmDefinition nvarchar(500);

    /* Build the SQL string one time.*/
    SET @SQLString =
         N'SELECT * FROM AdventureWorks.HumanResources.Employee
         WHERE ManagerID = @ManagerID';
    SET @ParmDefinition = N'@ManagerID tinyint';
    /* Execute the string with the first parameter value. */
    SET @IntVariable = 197;
    EXECUTE sp_executesql @SQLString, @ParmDefinition,
                          @ManagerID = @IntVariable;
    /* Execute the same string with the second parameter value. */
    SET @IntVariable = 109;
    EXECUTE sp_executesql @SQLString, @ParmDefinition,
                          @ManagerID = @IntVariable;
    --------------------------------------------------------------------

    DECLARE @IntVariable int;
    DECLARE @SQLString nvarchar(500);
    DECLARE @ParmDefinition nvarchar(500);
    DECLARE @max_title varchar(30);

    SET @IntVariable = 197;
    SET @SQLString = N'SELECT @max_titleOUT = max(Title)
       FROM AdventureWorks.HumanResources.Employee
       WHERE ManagerID = @level';
    SET @ParmDefinition = N'@level tinyint, @max_titleOUT varchar(30) OUTPUT';

    EXECUTE sp_executesql @SQLString, @ParmDefinition, @level = @IntVariable, @max_titleOUT=@max_title OUTPUT;
    SELECT @max_title;


    -----------------------------------------------------------
    更多的解释请参考 微软帮助文档。

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  • 原文地址:https://www.cnblogs.com/august/p/789592.html
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