Recognises a surrogate key without natural-key uniqueness
https://knobit.org/id/knobit/K-610
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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 natural keys, surrogate keys and key stability |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `party` with `party_id` as identity primary key and `registry_code` with no unique constraint; a reload registers every company again Acceptable: `uk_party_registry_code` (with the identifier type, where the logical model has one); `PHY-020` adds the surrogate, the unique constraint is added by hand (`ANO-012` when a uniqueness rule claims schema enforcement, `PHY-016` for type-2 dimensions) 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-610 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 04-physical, row 10; Karwin, ID Required; S&W 6.3; Codd 1979 §4 en |
| depends on knobit | Recognises an entity identified only by a system-assigned key |
| expected result | The natural key to make unique en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/06-physical/10 |
| rdfs:label | Recognises a surrogate key without natural-key uniqueness en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Surrogate key without natural-key uniqueness (physical model) en |
| skos:definition | A system-generated primary key added and the natural key not made a unique constraint. Nothing then stops the same thing being recorded twice. The physical form of logical row 18. en |
| skos:prefLabel | Recognises a surrogate key without natural-key uniqueness en |
| target object | surrogate primary key en |
Used by
| includes knobit | Designs a physical data model for the target platform without introducing anomalies |
|---|---|
| includes knobit | Forward engineering - physical data modelling |
| requires knobit | Design the physical data model |