Recognises a surrogate value with meaning, reused or renumbered
https://knobit.org/id/knobit/K-611
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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 persistent identifiers |
| applies knowledge | Explains natural keys, surrogate keys and key stability |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `account_id` printed on customer letters and renumbered after a purge; `loan_key` built as date plus sequence Acceptable: Identity or sequence values never reused, never displayed and with gaps accepted; the number customers see is a separate natural-key column with its own unique constraint 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-611 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 04-physical, row 11; Codd 1979 §4; Karwin, Pseudokey Neat-Freak; S&W 6.3 en |
| depends on knobit | Recognises an unstable or meaningful primary key |
| expected result | The surrogate and where its value escapes en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/06-physical/11 |
| rdfs:label | Recognises a surrogate value with meaning, reused or renumbered en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Surrogate value with meaning, reused or renumbered (physical model) en |
| skos:definition | A surrogate key whose value is shown to people, built from business data, reused after a delete, or renumbered to close gaps. Every reference held outside the table, in a file, a report or a letter, then points at the wrong row. Codd's surrogates are never shown to users and never controlled by them. A specific form of logical row 17. en |
| skos:prefLabel | Recognises a surrogate value with meaning, reused or renumbered en |
| target object | exposed or recycled surrogate value en |
Used by
| includes knobit | Designs a physical data model for the target platform without introducing anomalies |
|---|---|
| requires knobit | Design the physical data model |