Recognises an unmanaged duplicate column
https://knobit.org/id/knobit/K-601
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| Context functions | Result evaluation |
|---|---|
| Knobit creation methods | AI generated, AI edited |
| 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 derived data and point-in-time snapshots |
| applies knowledge | Explains controlled denormalisation |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `account.holder_name` copied from `party.name` for the account-servicing screen, no `derivation`, no DQ rule; the holder changes name and old accounts show the old one Acceptable: `derivation` names the source column and the mechanism that refreshes it, and a `consistency` DQ rule compares the two; or a view instead of a column. A copy meant to keep the value as at account opening is not a copy: the logical model says so (logical row 9) 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-601 |
| dcterms:identifier | Q-384 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 04-physical, row 1; Codd 1971; Kent 1983; E&N 1.6.1; C&B; S&W 12.6 en |
| dcterms:source | Shared-URI copy of data-modelling K-601 (Review checklist 04-physical (data-modelling), row 1; Codd 1971; Kent 1983; E&N 1.6.1; C&B; S&W 12.6) en |
| depends on knobit | Recognises an update anomaly in a logical data model |
| expected result | The copy, the original and what keeps them equal en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/06-physical/01 |
| rdfs:label | Recognises an unmanaged duplicate column en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| schema:isPartOf | Data quality management (DAMA-DMBOK2) |
| skos:altLabel | Unmanaged duplicate column (physical model) en |
| skos:definition | A column copied from another table to save a join, with nothing keeping the copy equal to the original. The update anomaly the logical model removed, put back. en |
| skos:prefLabel | Recognises an unmanaged duplicate column en |
| target object | column copied to save a join en |
Used by
| depends on knobit | Recognises a derived or copied column without a check |
|---|---|
| includes knobit | Designs a physical data model for the target platform without introducing anomalies |
| includes knobit | Derives data quality rules from the data rules and the physical model |
| includes knobit | Denormalisation |
| requires knobit | Design the physical data model |
| requires knobit | Derive data quality rules |