Sql server SQL-语法不正确，需要ID或引用的ID

我是SQL新手，正在尝试从表中删除约束

DECLARE @constraintName nvarchar(100)

set @constraintName = (SELECT  OBJECT_NAME(OBJECT_ID) AS NameofConstraint
FROM sys.objects
WHERE type_desc LIKE '%DEFAULT_CONSTRAINT' AND parent_object_id = OBJECT_ID('dbo.regression_pool_machine'))

ALTER TABLE dbo.regression_pool_machine DROP CONSTRAINT @constraintName

我在上一次使用@constraintName时遇到上述错误。

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打印出

@constraintName

将为我提供要删除的约束的值。任何帮助都将不胜感激

多亏了伊利亚·布尔索夫的评论，我发现这个解决方案是可行的

DECLARE @constraintName nvarchar(100)
    DECLARE @sqlCommand varchar(1000)
    set @constraintName = (SELECT  OBJECT_NAME(OBJECT_ID) AS NameofConstraint
    FROM sys.objects
    WHERE type_desc LIKE '%DEFAULT_CONSTRAINT' AND parent_object_id = OBJECT_ID('dbo.regression_pool_machine'))
    SET @sqlCommand = 'ALTER TABLE dbo.regression_pool_machine DROP CONSTRAINT ' + @constraintName
    EXEC (@sqlCommand)

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多亏了伊利亚·布尔索夫的评论，我发现这个解决方案是可行的

DECLARE @constraintName nvarchar(100)
    DECLARE @sqlCommand varchar(1000)
    set @constraintName = (SELECT  OBJECT_NAME(OBJECT_ID) AS NameofConstraint
    FROM sys.objects
    WHERE type_desc LIKE '%DEFAULT_CONSTRAINT' AND parent_object_id = OBJECT_ID('dbo.regression_pool_machine'))
    SET @sqlCommand = 'ALTER TABLE dbo.regression_pool_machine DROP CONSTRAINT ' + @constraintName
    EXEC (@sqlCommand)

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谢谢，这帮我解决了问题！谢谢，这帮我解决了问题！