Recognises inconsistent validity periods in a versioned table
https://knobit.org/id/knobit/K-623
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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 history strategies and validity-period conventions |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `dim_account` versions 2026-01-01..2026-06-30 and 2026-06-01..9999-12-31: a payment on 2026-06-15 joins both and is counted twice; two rows with `is_current = true` Acceptable: Half-open intervals `[valid_from, valid_to)` project-wide; a unique constraint on natural key plus `valid_from`; DQ rules for no overlap and exactly one current row per key (`PHY-015`, `PHY-016`) 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-623 |
| dcterms:identifier | Q-391 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 04-physical, row 23; DDL 2014 ch. 13; S&W 15.4 en |
| dcterms:source | Shared-URI copy of data-modelling K-623 (Review checklist 04-physical (data-modelling), row 23; DDL 2014 ch. 13; S&W 15.4) en |
| expected result | Overlaps, unintended gaps or mixed bounds, and the convention to apply en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/06-physical/23 |
| rdfs:label | Recognises inconsistent validity periods in a versioned table en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| schema:isPartOf | Data quality management (DAMA-DMBOK2) |
| skos:altLabel | Overlapping, gapped or inconsistently bounded validity periods (physical model) en |
| skos:definition | In a table with validity periods, two versions of one key valid at the same time (contradiction), consecutive identical versions (circumlocution), gaps nobody meant, or closed intervals in one table and half-open in another. A point-in-time join then returns two rows or none. en |
| skos:prefLabel | Recognises inconsistent validity periods in a versioned table en |
| target object | validity periods en |
Used by
| depends on knobit | Recognises history kept without its constraints checked |
|---|---|
| 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 |
| requires knobit | Design the physical data model |
| requires knobit | Derive data quality rules |