Explains lossless-join decomposition
https://knobit.org/id/knobit/K-563
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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 | Decides for sample decompositions whether joining back produces spurious rows 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-563 |
| 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 | A split is lossless only if the shared attributes are a key of at least one part en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/05-logical/K-563 |
| rdfs:label | Explains lossless-join decomposition en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:definition | A split is lossless only if the shared attributes are a key of at least one part. en |
| skos:prefLabel | Explains lossless-join decomposition en |
| target object | lossless-join decomposition en |
Used by
| applies knowledge | Recognises a lossy decomposition |
|---|---|
| applies knowledge | Decomposes an entity along a functional dependency without loss |
| depends on knobit | Explains vertical and horizontal partitioning of tables |
| includes knobit | Derives a normalised logical data model and traces anomalies to their causes |
| requires knobit | Derive the logical data model |