Stage 6: Design the physical data model
Knobit of Data modelling · K-652 · Knowledge
Explains the implementation options for subtypes
What it means
Roll up, roll down or one table per type, and the constraints each loses.
How it is assessed
Chooses an implementation for sample subtypings and names the constraints to restore
Builds on
- Explains supertype and subtype constraintsK-566 · Knowledge