5. etapp: Loogilise andmemudeli tuletamine
Kompetentsi Andmete modelleerimine knobit · K-568 · Teadmine
Explains natural keys, surrogate keys and key stability
Mida see tähendab
What makes a key stable and meaningless, and why a natural key is kept as a unique identifier.
Kuidas seda hinnatakse
Classifies sample keys as stable or not and meaningful or not, and says which to keep as natural keys
Tugineb
- Explains candidate key and prime attributeK-552 · Teadmine