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Ryan 2023-06-14 15:11:30 +08:00
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@ -1002,6 +1002,12 @@
- Subclass :-> A distinct subgrouping of occurrences of an entity - Subclass :-> A distinct subgrouping of occurrences of an entity
id:: 64895f39-d886-436b-9afe-ba75d37c8b45 id:: 64895f39-d886-436b-9afe-ba75d37c8b45
type. type.
- When to use them? eith
1. There are attributes that apply to some (but
not all) instances of an entity.
2. The instances of a potential subclass
participate in a relationship unique to that
subclass.
- LATER designing ER diagram - LATER designing ER diagram
- DONE Block 3 - DONE Block 3
collapsed:: true collapsed:: true