5. etapp: Loogilise andmemudeli tuletamine
Kompetentsi Andmete modelleerimine knobit · K-569 · Teadmine
Explains the connection, fan and chasm traps
Mida see tähendab
How a path of relationships can state a fact that was never recorded, lose a question, or drop instances.
Kuidas seda hinnatakse
Names the trap on sample paths of two relationships and what each lets a reader wrongly conclude
Tugineb
- Explains relationship cardinality and optionalityK-567 · Teadmine
Vajalik
- Recognises a connection trapK-523 · Oskus
- Recognises a fan trapK-524 · Oskus
- Recognises a chasm trapK-525 · Oskus
- Recognises a nullable foreign key on a reporting join pathK-628 · Oskus