Mapa mental
DB Relationships
Conteúdo do mapa
DB Relationships
Weak Entity
- Depends on some other entity type
- e.g. next of kin dependent on entity staff
Multi valued attribute
- Holds multiple values for a single entity
Recursive
- Entity type that is in a relationship with itself
Ternary
- Where three entity types are related
Strong Entity
- Entity that is not dependent on another entity
Single valued attribute
- Holds a single value for a single entity
Derived Attribute
- Derivable from the value of a related attribute
Informações
- Descrição
- Mapa Mental sobre DB Relationships, criado por Ian Arbuckle em 03-01-2015.
- Criado por
- Ian Arbuckle
- Visualizações
- 2
- Avaliação