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Projektovanje relacione Å¡eme baze podataka

Projektovanje relacione Å¡eme baze podataka

Projektovanje relacione Å¡eme baze podataka

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• Primer:Normalne forme– U = {MBR,IME,PRZ,ADR,TEL}– F = {MBR→IME+PRZ+ADR+TEL}– ADR = {PTT,MESTO,ULICA,BROJ}, TEL={POZBR,BRTEL}– ako se u skupu U složena obeležja ADR i TEL zameneodgovarajućim skupovima obeležja, u tako dobijenomskupu obeležja važi i f.z. PTT→POZBR– dekomponovanje složenog obeležja na elementarnaobeležja može dovesti do definisanja funkcionalnihzavisnosti koje se inače ne bi mogle izraziti<strong>Projektovanje</strong> <strong>relacione</strong> šeme <strong>baze</strong> <strong>podataka</strong> 12/38

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