Recognises rolled-up subtypes losing conditional constraints
https://knobit.org/id/knobit/K-606
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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 the implementation options for subtypes |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `account` holds both loan accounts and current accounts; `loan_maturity_date` nullable for all rows, so a loan account without a maturity date loads, and so does a current account with one Acceptable: `CHECK ((account_type_code = 'LOAN' AND loan_maturity_date IS NOT NULL) OR (account_type_code <> 'LOAN' AND loan_maturity_date IS NULL))` citing the rule; on platforms that do not enforce CHECK, a DQ rule. Each subtype-only column's `comment` says which subtype it applies to 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-606 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 04-physical, row 6; E&N 9.2; S&W 11.3; Codd 1979 §2.3 en |
| depends on knobit | Recognises attributes inapplicable to some instances |
| expected result | The columns whose subtype obligation is lost, and the discriminator or check needed en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/06-physical/06 |
| rdfs:label | Recognises rolled-up subtypes losing conditional constraints en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Subtypes rolled up, conditional constraints lost (physical model) en |
| skos:definition | Supertype and subtypes in one table. Columns that are mandatory for one subtype become nullable for all, so the database accepts a row missing a value its subtype requires, and accepts values on rows they do not apply to. en |
| skos:prefLabel | Recognises rolled-up subtypes losing conditional constraints en |
| target object | supertype and subtypes in one table en |
Used by
| includes knobit | Designs a physical data model for the target platform without introducing anomalies |
|---|---|
| requires knobit | Design the physical data model |