Explains an entity type as the realisation of one business concept

K-570 · Knowledge knobit · Activity: Derive the logical data model · Competence: Data modelling

An entity type realises one glossary concept; its instances differ by values, not by type.

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What it looks like in practice

Expected result: An entity type realises one glossary concept; its instances differ by values, not by type

How it is assessed: Decides for sample entity pairs whether they are one concept, two, or one split by a value

Related knobits

Needed for

• K-527 Recognises overlapping entities
• K-528 Recognises one entity split by value into several

All 56 knobits of Derive the logical data model.

Source: Normalisation theory and relational design (Codd, Fagin, Date), as used by the stage 5 reference and review checklist