Stage 5: Derive the logical data model
Knobit of Data modelling · K-560 · Knowledge
Explains sixth normal form for temporal data
What it means
Attributes that change independently over time get their own validity periods.
How it is assessed
Groups the attributes of a sample history entity by when they change and justifies the split
Builds on
- Explains join dependency and fifth normal formK-559 · Knowledge
Needed by
- Recognises independently changing histories in one entityK-520 · Skill
- Explains time-based modelling schemesK-908 · Knowledge