mysql - How to edit a foreign key in many-to-many relationship (Database-first) -


I think this is a very simple issue but I can not understand it ..

< P> I am using ATP.NET MVC5, unit frame 6 (still quite new in all this).

I have multiple relationships between 2 tables, here's an example:

I can add zipcode masks to my countries, but I think the references to existing ones can not be edited as an EP How can this be done? Instead of editing an existing zipodmask, I've finished it and added a new one.


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