Recognises binary floating point used for an exact quantity
https://knobit.org/id/knobit/K-618
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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 exact and approximate numeric types |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `payment_amount FLOAT`: the sum over payments differs from the statement total by cents. `loan_interest_rate REAL`: a repayment schedule rebuilt from it does not reproduce the instalments Acceptable: `NUMERIC(12,2)` for euro amounts, `NUMERIC(9,6)` for interest rates, scale as the business states it; floating point only for quantities that are approximate by nature (a model's risk score) 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-618 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 04-physical, row 18; Karwin, Rounding Errors; S&W 11.4 en |
| expected result | The column and the exact decimal type it needs en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/06-physical/18 |
| rdfs:label | Recognises binary floating point used for an exact quantity en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| skos:altLabel | Approximate number for an exact quantity (physical model) en |
| skos:altLabel | Money in binary floating point (generated DDL) en |
| skos:definition | `FLOAT`, `REAL` or `DOUBLE` for money, areas, shares or anything compared for equality or totalled. Totals do not tie and equality tests fail. A specific form of row 17. en |
| skos:prefLabel | Recognises binary floating point used for an exact quantity en |
| target object | FLOAT, REAL or DOUBLE for money or totals en |
Used by
| includes knobit | Designs a physical data model for the target platform without introducing anomalies |
|---|---|
| includes knobit | Generates DDL per target dialect and reviews it against model, engine, data and deployment |
| requires knobit | Design the physical data model |
| requires knobit | Generate and review DDL |
| schema:supersededBy | Money in binary floating point (generated DDL) |