Karteikarten
Keys
Karten in diesem Stapel (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.
Informationen
- Beschreibung
- Karteikarten am Keys, erstellt von goldj059.3031242 am 29/09/2013.
- Erstellt von
- goldj059.3031242
- Aufrufe
- 22
- Bewertung