Stage 5: Derive the logical data model
Knobit of Data modelling · K-566 · Knowledge
Explains supertype and subtype constraints
What it means
Disjoint or overlapping, total or partial subtyping, and what each allows.
How it is assessed
States the disjointness and completeness of sample subtypings from their business rules
Builds on
- None
Needed by
- Recognises attributes inapplicable to some instancesK-516 · Skill
- Recognises undeclared subtype constraintsK-519 · Skill
- Introduces subtypes for attributes applying to only some instancesK-536 · Skill
- Explains the implementation options for subtypesK-652 · Knowledge