Recognises an insertion anomaly in a logical data model

Mida see tähendab

A fact cannot be recorded without also recording another fact it does not depend on, because it has no entity of its own.

Kuidas seda hinnatakse

Flags the deficient case and passes the acceptable one. Deficient: Branch name held only on Account, so a newly opened branch cannot be recorded until an account is serviced there Acceptable: Branch as a reference entity keyed by Branch Identifier; Account carries only the identifier (cause: row 9)

Tugineb

Explains the insertion, update and deletion anomaliesK-553 · Teadmine

Vajalik

Puudub