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Schema to ER
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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.
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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