Money in binary floating point (generated DDL)
https://knobit.org/id/knobit/K-815
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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 |
| assessment criterion | Flags the deficient case and passes the acceptable one. Deficient: `instructed_amount DOUBLE PRECISION`; the daily settlement total differs from core banking by a few cents, and by a different few cents after the table is repartitioned Acceptable: `DECIMAL(14,2)` as the sample model has it, and `DECIMAL`/`NUMERIC` for every amount and for `loan_interest_rate` (e.g. `DECIMAL(7,5)`). `FLOAT` only for a statistic nobody reconciles, such as a propensity score 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-815 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Review checklist 05-ddl, row 15; IEEE 754; ISO 9075 en |
| expected result | A finding that names the defective generated DDL element and the defect en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-modelling/08-ddl/15 |
| rdfs:label | Money in binary floating point (generated DDL) en |
| schema:creativeWorkStatus | superseded |
| schema:isPartOf | Data modelling (DAMA-DMBOK2) |
| schema:supersededBy | Recognises binary floating point used for an exact quantity |
| skos:definition | `FLOAT`, `REAL` or `DOUBLE PRECISION` on anything that is money — an amount, a balance, a rate applied to money, a quantity that is summed and then reconciled. 0.01 has no exact binary representation, so the total depends on the order of the rows and the ledger never agrees twice. en |
| skos:prefLabel | Money in binary floating point (generated DDL) en |
| target object | generated DDL en |