Recognises rolled-down subtypes losing supertype constraints
https://knobit.org/id/knobit/K-607
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| Context functions | Result evaluation |
|---|---|
| Knobit creation methods | AI generated, human edited |
| Knobit types | Skill |
| LCG purposes | Assessing the learner's knowledge or skill state |
| LCG purposes | Selecting an assessment task or learning activity |
| action verb | Recognises en |
| applies knowledge | Explains the implementation options for subtypes |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `person` and `organisation`, no `party`; `account_holder.party_id` cannot have a foreign key; nothing stops one id being used in both tables Acceptable: A `party` table with the shared key; `person` and `organisation` keyed by `party_id` with an FK to it; exclusivity enforced by carrying the discriminator into each subtype's key, or by a DQ rule en |
| assessment method | skill-tests task: Loan application physical model on Snowflake (physical design anomaly skills) en |
| conforms to profile | https://oppekava.edu.ee/a/Knobitite_kirjeldamise_ja_seostamise_reeglid#LCG-KNOBIT-0.1 |
| dcterms:identifier | K-607 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 04-physical, row 7; E&N 9.2; S&W 11.3 en |
| depends on knobit | Recognises undeclared subtype constraints |
| expected result | The lost cross-subtype uniqueness and supertype reference en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/06-physical/07 |
| rdfs:label | Recognises rolled-down subtypes losing supertype constraints en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Subtypes rolled down, supertype constraints lost (physical model) en |
| skos:definition | One table per subtype and none for the supertype. Uniqueness across subtypes cannot be declared, nothing stops one instance appearing in two subtype tables, and a relationship to the supertype has no single table to reference, so it becomes a polymorphic association (logical row 22). en |
| skos:prefLabel | Recognises rolled-down subtypes losing supertype constraints en |
| target object | one table per subtype en |
Used by
| includes knobit | Designs a physical data model for the target platform without introducing anomalies |
|---|---|
| requires knobit | Design the physical data model |