Stage 5: Derive the logical data model
Knobit of Data modelling · K-569 · Knowledge
Explains the connection, fan and chasm traps
What it means
How a path of relationships can state a fact that was never recorded, lose a question, or drop instances.
How it is assessed
Names the trap on sample paths of two relationships and what each lets a reader wrongly conclude
Builds on
- Explains relationship cardinality and optionalityK-567 · Knowledge
Needed by
- Recognises a connection trapK-523 · Skill
- Recognises a fan trapK-524 · Skill
- Recognises a chasm trapK-525 · Skill
- Recognises a nullable foreign key on a reporting join pathK-628 · Skill