Recognises a referential action destroying what should survive
https://knobit.org/id/knobit/K-613
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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 referential integrity and referential actions |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `fk_payment_account` with `on_delete: cascade`: purging a closed account deletes its payments and holds. `fk_payment_authorised_by` with `set null`: deleting a user erases who authorised the payment Acceptable: `on_delete: restrict` by default; `cascade` only for children that cannot exist without the parent (an instalment with its repayment schedule), with the data rule cited 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-613 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 04-physical, row 13; Codd 1979 §2.1; E&N 6.2; Codd 1971 en |
| depends on knobit | Recognises a deletion anomaly in a logical data model |
| expected result | The action and the child to keep en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/06-physical/13 |
| rdfs:label | Recognises a referential action destroying what should survive en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Referential action deletes or erases what should survive (physical model) en |
| skos:definition | `ON DELETE CASCADE` or `SET NULL` on a relationship whose child has a life of its own. A deletion anomaly made automatic: deleting one fact silently deletes or erases another. en |
| skos:prefLabel | Recognises a referential action destroying what should survive en |
| target object | ON DELETE CASCADE or SET NULL en |
Used by
| includes knobit | Designs a physical data model for the target platform without introducing anomalies |
|---|---|
| requires knobit | Design the physical data model |