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sanv 0 Newbie Poster

Hi,

I wanted to ask if I have the folling relations in my db:

A(nb, ziel, total)
B(nb, platz, uid?)
C(uid, name, stammkunde?)

where B.nb -> A.nb, B.uid -> C.uid

Now if I translate that into a ER model, would it be (1) or (2):

where in 2, A and B are related through a "subclass" hierarchy.

Thanks in advance.

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