6. etapp: Füüsilise andmemudeli kujundamine
Kompetentsi Andmete modelleerimine knobit · K-652 · Teadmine
Explains the implementation options for subtypes
Mida see tähendab
Roll up, roll down or one table per type, and the constraints each loses.
Kuidas seda hinnatakse
Chooses an implementation for sample subtypings and names the constraints to restore
Tugineb
- Explains supertype and subtype constraintsK-566 · Teadmine