Sql server sql server中select语句中的表名变量

我想在select语句中使用tablename变量，但它给出了一个错误

-必须声明表变量“@table”

---

这是我的代码的快照

您需要为此使用动态sql：

alter PROCEDURE testTblName
(
@id int,
@name varchar(50)
)
AS
BEGIN
   declare @table varchar(50)
   declare @add varchar(150)
   set @table = 'DBTest..testMaster'
   DECLARE @sql NVARCHAR(MAX)
   SELECT @sql = 'select @add = address from ' + @table + ' where id= ' + @id + ' and name= ' + @name
   EXEC sp_executesql @sql

END

---

您需要为此使用动态sql：

alter PROCEDURE testTblName
(
@id int,
@name varchar(50)
)
AS
BEGIN
   declare @table varchar(50)
   declare @add varchar(150)
   set @table = 'DBTest..testMaster'
   DECLARE @sql NVARCHAR(MAX)
   SELECT @sql = 'select @add = address from ' + @table + ' where id= ' + @id + ' and name= ' + @name
   EXEC sp_executesql @sql

END

---

我想，你必须做出这样的贡献

alter PROCEDURE testTblName
(
@id int,
@name varchar(50)
)
AS
BEGIN
    declare @table varchar(50)
    declare @add varchar(Max)
    set @table = 'DBTest..testMaster'

    Set  @add = 'Select address from ' + @table + ' where id = ' + CAST(@id AS VARCHAR(10)) + ' and name = ' + @name

    Exec(@add)
END

---

我想，你必须做出这样的贡献

alter PROCEDURE testTblName
(
@id int,
@name varchar(50)
)
AS
BEGIN
    declare @table varchar(50)
    declare @add varchar(Max)
    set @table = 'DBTest..testMaster'

    Set  @add = 'Select address from ' + @table + ' where id = ' + CAST(@id AS VARCHAR(10)) + ' and name = ' + @name

    Exec(@add)
END

---

不能将变量用作表名。当您从@table选择地址时，SQL希望

@table

是表类型的变量，而不是标量

您希望执行以下操作：

ALTER PROCEDURE testTblName
(
    @id INT,
    @name VARCHAR(50)
)
AS
BEGIN
    DECLARE @table VARCHAR(50),
            @add VARCHAR(150),
            @params VARCHAR(200),
            @sql VARCHAR(200);

    SET @params = '@add VARCHAR(50) OUTPUT';

    SET @table = 'DBTest..testMaster'

    SET @sql = 'SELECT @add = address FROM ' + @table + ' WHERE id=' + @id + ' AND name=' + @name

    EXEC sp_executesql @sql, @params, @add OUTPUT;

    ...
    ...
END

---

不能将变量用作表名。当您从@table选择地址时，SQL希望

@table

是表类型的变量，而不是标量

您希望执行以下操作：

ALTER PROCEDURE testTblName
(
    @id INT,
    @name VARCHAR(50)
)
AS
BEGIN
    DECLARE @table VARCHAR(50),
            @add VARCHAR(150),
            @params VARCHAR(200),
            @sql VARCHAR(200);

    SET @params = '@add VARCHAR(50) OUTPUT';

    SET @table = 'DBTest..testMaster'

    SET @sql = 'SELECT @add = address FROM ' + @table + ' WHERE id=' + @id + ' AND name=' + @name

    EXEC sp_executesql @sql, @params, @add OUTPUT;

    ...
    ...
END

---

您正在尝试创建表变量吗？您不能将变量用于这样的表名，这仅在动态SQL中可能，因为该变量不能用于替代对象名或关键字。您正在尝试创建表变量吗？您不能将变量用于这样的表名，只有在动态SQL中才有可能，因为变量不能代替对象名或关键字。感谢@Radu的帮助感谢@Radu的帮助