Explains natural keys, surrogate keys and key stability
https://knobit.org/id/knobit/K-568
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| Context functions | Object understanding |
|---|---|
| Knobit creation methods | AI generated |
| Knobit types | Knowledge |
| LCG purposes | Assessing the learner's knowledge or skill state |
| LCG purposes | Opening up a learning outcome |
| action verb | Explains en |
| assessment criterion | Classifies sample keys as stable or not and meaningful or not, and says which to keep as natural keys en |
| assessment method | Written question with sample entities en |
| conforms to profile | https://oppekava.edu.ee/a/Knobitite_kirjeldamise_ja_seostamise_reeglid#LCG-KNOBIT-0.1 |
| dcterms:identifier | K-568 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Normalisation theory and relational design (Codd, Fagin, Date), as used by the stage 5 reference and review checklist en |
| depends on knobit | Explains candidate key and prime attribute |
| expected result | What makes a key stable and meaningless, and why a natural key is kept as a unique identifier en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/05-logical/K-568 |
| rdfs:label | Explains natural keys, surrogate keys and key stability en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:definition | What makes a key stable and meaningless, and why a natural key is kept as a unique identifier. en |
| skos:prefLabel | Explains natural keys, surrogate keys and key stability en |
| target object | natural key, surrogate key and key stability en |
Used by
| applies knowledge | Recognises an unstable or meaningful primary key |
|---|---|
| applies knowledge | Recognises an entity identified only by a system-assigned key |
| applies knowledge | Recognises a surrogate key without natural-key uniqueness |
| applies knowledge | Recognises a surrogate value with meaning, reused or renumbered |
| includes knobit | Derives a normalised logical data model and traces anomalies to their causes |
| includes knobit | Forward engineering - logical data modelling |
| includes knobit | Attribute and identifiers |
| requires knobit | Derive the logical data model |