不进行强制转换就无法完成.

It can't be done without casting.

请记住，您可以具有内容完全相同的多种类型，并为每种类型创建一个重载.数据库将如何选择正确的类型和功能?

Remember that you can have multiple types with the exactly same content and create a overload for each one of them. How would the database choose the right type and function?