5. etapp: Loogilise andmemudeli tuletamine
Kompetentsi Andmete modelleerimine knobit · K-503 · Oskus
Recognises a deletion anomaly in a logical data model
Mida see tähendab
Deleting one fact deletes another that should have survived.
Kuidas seda hinnatakse
Flags the deficient case and passes the acceptable one. Deficient: Branch BIC held only on Account; the branch's last account is closed and purged and the BIC goes with it Acceptable: Branch holds the BIC; Account references Branch
Tugineb
- Explains the insertion, update and deletion anomaliesK-553 · Teadmine