Im not quite sure how to read ternary relationships within a ER-Diagram. Lets say this is the ternary relationship that is given. What can I interpret out of that?
It says that you have to put your hand on 2 entity sets and then read it like that.
Hand on Account and User: A pair of Account and User can be associated with M projects.
Hand on Account and Project: A pair of Account and Project can be associated with M users.
Hand on Project and User: A pair of Project and User can be associated with 1 Account.
Are the pairs always in a one to one relationship or how many pairs can there be?
Most likely it's a hierarchy and it's means there are many account and many users. It's also means account is smaller or equal to user. It means more users to account. Most likely I use ternary data structure with tries.