@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix edu: <https://knobit.org/def/> .
@prefix knobit: <https://knobit.org/id/knobit/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix register: <https://knobit.org/id/register/> .
@prefix schema: <https://schema.org/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

knobit:K-809 a edu:Knobit ;
    rdfs:label "Recognises an expression running on one engine only"@en ;
    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 ;
    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 ;
    edu:actionVerb "Recognises"@en ;
    edu:appliesKnowledge knobit:K-852 ;
    edu:assessmentCriterion "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 ;
    edu:assessmentMethod "skill-tests task: Generated DDL review, Postgres and Snowflake (DDL review skills)"@en ;
    edu:contextFunction <https://knobit.org/def/contextFunction/resultEvaluation> ;
    edu:creationMethod <https://knobit.org/def/creationMethod/aiGeneratedHumanEdited> ;
    edu:expectedResult "The vendor-specific expression and its portable form"@en ;
    edu:graphRelevance <https://knobit.org/def/graphRelevance/learnerState>,
        <https://knobit.org/def/graphRelevance/taskSelection> ;
    edu:knobitType <https://knobit.org/def/knobitType/skill> ;
    edu:targetObject "check or default expression"@en ;
    schema:creativeWorkStatus "accepted" ;
    schema:isPartOf register:data-modelling .

edu:Knobit rdfs:label "Knobit"@en,
        "Knobit"@et .

knobit:K-852 rdfs:label "Explains SQL dialect differences"@en .