Recognises a type meaning something else on another engine
https://knobit.org/id/knobit/K-812
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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 SQL dialect differences |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `is_business_day BOOLEAN` on MySQL becomes `TINYINT(1)` with no check and a loader writes `2` for a half day. `account_number VARCHAR(20)` on Databricks accepts a 34-character value, and the joins to `fact_payment` start missing Acceptable: A check constraint for the 0/1 domain wherever the engine has no boolean, and the modelled length kept as a DQ rule on every target that does not enforce it — the header note says which ones those are en |
| assessment method | skill-tests task: Generated DDL review, Postgres and Snowflake (DDL review skills) en |
| conforms to profile | https://oppekava.edu.ee/a/Knobitite_kirjeldamise_ja_seostamise_reeglid#LCG-KNOBIT-0.1 |
| dcterms:identifier | K-812 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 05-ddl, row 12; ISO 9075; this skill (08-ddl.md) en |
| expected result | The type and its meaning on each engine en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/08-ddl/12 |
| rdfs:label | Recognises a type meaning something else on another engine en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Type that silently means something else (generated DDL) en |
| skos:definition | One modelled type rendering to a different meaning per engine. `TIMESTAMP` is a row-version counter in T-SQL (emitted `DATETIME2(6)`) and 32-bit, 2038-bounded and session-time-zone-converting in MySQL (emitted `DATETIME`); `BOOLEAN` becomes `NUMBER(1)` on Oracle and `TINYINT(1)`, which accepts 42, on MySQL; Databricks collapses `VARCHAR(n)` to `STRING`. en |
| skos:prefLabel | Recognises a type meaning something else on another engine en |
| target object | modelled type rendered per engine en |
Used by
| includes knobit | Generates DDL per target dialect and reviews it against model, engine, data and deployment |
|---|---|
| requires knobit | Generate and review DDL |