据我所知，不可能改变/修改表类型.你可以创建具有不同名称的类型，然后删除旧类型并将其修改为新名称

As of my knowledge it is impossible to alter/modify a table type.You can create the type with a different name and then drop the old type and modify it to the new name

感谢 jkrajes

根据 msdn，它就像用户自定义表类型定义创建后不可修改'.

As per msdn, it is like 'The user-defined table type definition cannot be modified after it is created'.