Flashcards
Keys
Flashcards do conjunto (3)
- 1Primary KeysThe value this key holds should be unique for each record in the database
- 2Secondary KeysAn alternate key which can be used in addition to the primary key to locate specific records
- 3Foreign KeysThese keys are used to create relationships between tables. By creating a relationship between two tables, you can reduce the amount of redundant data in a database, and reduce data duplication.
Informações
- Descrição
- FlashCards sobre Keys, criado por goldj059.3031242 em 29-09-2013.
- Criado por
- goldj059.3031242
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