Hi,

assume that you have a relation "Person has many addresses" with two entities 
"Person" and "Address".

If you declare a bidirectional relationship, your code can navigate from Person 
to Address, and from Adress to Person.

With a unidirectional relationship, your code can navigate only from one side 
to the other. E.g. you can get the addresses of a person, but you cannot get 
the person of an address.

The database representation of the relationship is not affected by your 
unidirectional/bidirectional decision. This defines only, how the code side 
looks like.

Hope this helps

Wolfgang

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