5. etapp: Loogilise andmemudeli tuletamine
Kompetentsi Andmete modelleerimine knobit · K-551 · Teadmine
Explains functional dependency
Mida see tähendab
A dependency X -> Y holds when each value of X determines exactly one value of Y.
Kuidas seda hinnatakse
States the definition and lists the functional dependencies of a sample entity from its business rules, not from its attribute names
Tugineb
- Puudub
Vajalik
- Records the functional dependencies of an entityK-532 · Oskus
- Explains candidate key and prime attributeK-552 · Teadmine
- Explains dependency preservationK-564 · Teadmine