Entity-relationship Questions

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UML : Optional Foreign Key

I'm sitting with a little headache about a problem right now. i have two entities payment order and account

Core Data Many To Many Relations

I have a problem with ios core data and many to many relations. i want to write a fitness application. so i need three tables. following
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Understanding ER diagrams

I try to understand er diagrams and i came across an example that i'm not sure how to "look" at it.. consider this diagram:

java complex search

I am trying to build a java based web application using spring boot and rest architecture using spring mvc for the following purpose:

Multiple Inheritance ER Model

In enhanced er modelling subclass inheriting from more than 1 super-class is called multiple inheritance! please explain me this using a
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