How to express a “some of which are” and “not all are” relationship with enhanced entity-relationship diagrams?
-
07-01-2021 - |
Question
For example:
Gardens
have attribute gate
, Condos
have attribute door
. Some of the Gardens
and Condos
are Private_Properties
. On the other hand, Private_Properties
are not restricted to only Gardens
or Condos
.
How can these non-exclusive relationship be illustrated with an enhanced entity-relationship diagram (EERD)?
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