MODELAREA DATELOR - Baze de date
MODELAREA DATELOR - Baze de date
MODELAREA DATELOR - Baze de date
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CLASIFICARE ATRIBUTE<br />
atributele <strong>de</strong> i<strong>de</strong>ntificare (formand impreuna<br />
i<strong>de</strong>ntificatorul entitatii) reprezinta acea<br />
multime <strong>de</strong> atribute care permit distinctia<br />
intre instantele aceleiasi entitati .<br />
atributele <strong>de</strong> <strong>de</strong>scriere (sau <strong>de</strong>scriptori) sunt<br />
folositi pentru memorarea caracteristicilor<br />
suplimentare ale instantelor.<br />
Exemplu: Pentru entitatea STUDENTI<br />
Matricola este atribut <strong>de</strong> i<strong>de</strong>ntificare<br />
celelalte atribute sunt <strong>de</strong>scriptori<br />
F. Radulescu. Curs: <strong>Baze</strong> <strong>de</strong> <strong>date</strong> 40
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