Recognises an expression running on one engine only
https://knobit.org/id/knobit/K-809
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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: `ck_fact_payment_reference` written as `payment_reference ~ '^[A-Z0-9]{8,24}$'`; it generates on all five targets and deploys only on Postgres. `COALESCE(valid_to_date, 'infinity')` in `ck_dim_account_version_dates` fails everywhere but Postgres Acceptable: Portable expressions only — comparisons, `BETWEEN`, `IN`, `IS NULL`, `LENGTH`: `LENGTH(payment_reference) BETWEEN 8 AND 24` as the constraint and the pattern as a `validity` DQ rule; a closed end date instead of `'infinity'` 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-809 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 05-ddl, row 9; ISO 9075; this skill (08-ddl.md) en |
| expected result | The vendor-specific expression and its portable form en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/08-ddl/09 |
| rdfs:label | Recognises an expression running on one engine only en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Expression that only runs on one engine (generated DDL) en |
| skos:definition | Check-constraint and default expressions pass through verbatim — the generator orders the column clauses per dialect (Oracle and Snowflake want `DEFAULT` before `NOT NULL`) but it cannot translate an expression. Look for vendor functions, regex operators, `||` versus `+`, and date arithmetic. en |
| skos:prefLabel | Recognises an expression running on one engine only en |
| target object | check or default expression 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 |