这是糟糕设计的明显标志.您永远不需要这样做，如果您这样做了，那么您需要重新考虑您的设计.

That is a clear sign of a bad design. You should never need to do this and if you do then you need to rethink your design.

您不能将一个字段与两个不同的 FK 相关联.

You cannot make a field be associated with two different FKs.