Recognises a cardinality rule stated from one end only

Mida see tähendab

A cardinality rule stated from one end, leaving the other end unconstrained. The commonest cause of duplicates.

Kuidas seda hinnatakse

Flags the deficient case and passes the acceptable one. Deficient: "Each account has exactly one IBAN" (nothing stops two accounts sharing one) Acceptable: Both: "each account has exactly one IBAN" and "each IBAN is held by at most one account"

Tugineb

Explains relationship cardinality and optionalityK-567 · Teadmine

Vajalik

Puudub