Flashcards
Database design
Flashcards do conjunto (6)
- 1What is an entity type?Represents a physical or abstract concept with some sort of identity and some descriptive features.
- 2What is an attribute?The descriptive features of entities are called attributes.
- 3What is an entity?Corresponds to a set of entities having the same set of attributes.
- 4What is a relationship type?Represents a connection between two or more entity types.
- 5What is a key?An attribute that has unique values for every instance of an entity type.
- 6What is a weak entity type?Those that are meaningless without an owner entity type.
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- Descrição
- 1 Database FlashCards sobre Database design, criado por linneamd em 14-03-2016.
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- linneamd
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