p. atzeni et al., from 19991 progetto prisma – area vasta emilia nord
TRANSCRIPT
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progettazione concettuale
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spesso non tradotto per evitare confusioni con relazione (traduzione di relation)
traducibile con associazione o correlazione
• Legame logico tra due o più entità, di interesse per l’applicazione
• Classe di fatti di interesse
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spesso non tradotto per evitare confusioni con relazione (traduzione di relation): traducibile con associazione o correlazione
• Legame logico tra due o più entità, di interesse per l’applicazione
• Classe di fatti di interesse
• scegliere nomi espressivi, al singolare
• usare sostantivi e non verbi (se possibile)
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nello schema concettuale rappresentiamo le entità e le relationship, non le singole istanze
astrazione
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• proprietà elementare di una entità o di una relationship (di interesse dell’applicazione)
• associa un valore a ciascuna occorrenza dell’entità o della relationship su cui è definito
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e gli identificatori delle relationship?
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• dizionario dei dati
• vincoli non esprimibili (nello schema e nel dizionario)
• entità
• relationship
con relativi attributi
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progettazione concettuale
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