Quote: design flaws in databases include anonymous address fields, sequence numbers for one-many relations, overloaded foreign keys, propagated identity

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Several databases had anonymous address fields … [making] it difficult to distinguish Chicago the city … Some database designs used a sequence number to … Another common flaw was overloaded foreign keys [distinguished by a switch]. … Several databases had propagated identity … [p. 24] Propagated identity leads to multiattribute primary keys … but must be duplicated to enforce the referential …   Google-1   Google-2

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