5. etapp: Loogilise andmemudeli tuletamine
Kompetentsi Andmete modelleerimine knobit · K-526 · Oskus
Recognises a redundant relationship
Mida see tähendab
Two paths between the same entities state the same fact, so they can disagree.
Kuidas seda hinnatakse
Flags the deficient case and passes the acceptable one. Deficient: Payment → Account → Party (account holder), plus a direct Payment → Party meaning the same person Acceptable: Remove the direct relationship; keep it only if it means something else (the counterparty who instructed the payment, who need not be the account holder), named so and with its own rule
Tugineb
- Explains relationship cardinality and optionalityK-567 · Teadmine
- Explains derived data and point-in-time snapshotsK-565 · Teadmine
Vajalik
- Puudub