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Ryan 2023-06-14 14:43:28 +08:00
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pages/总复习2023t1.md
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@ -974,12 +974,20 @@
specialization/generalization:
- participation constraints :-> Determines whether every member in superclass
must participate as a member of a subclass.
- May be {{c1 mandatory}} or {{c1 optional}}. #flashcard
- May be mandatory or optional. #flashcard
id:: 648960d0-ae7f-4452-a1b9-cab8a9b13443
- Mandatory: member of superclass must be
member of subclass
- Optional: member of superclass may be member
of subclass.
- disjoint constraints :-> Describes relationship between members of the
subclasses and indicates whether member of a
superclass can be a member of one, or more than
one, subclass.
one, subclass. #flashcard
- Disjoint: member of superclass is member of at
most one subclass
- Disjoint: member of superclass is member of at
most one subclass
- Superclass / Subclass
- Superclass :-> An entity type that includes one or more distinct
id:: 64895f2f-b868-46ec-9d80-7079eaf3197d