MODELAREA DATELOR - Baze de date
MODELAREA DATELOR - Baze de date
MODELAREA DATELOR - Baze de date
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TRANSFORMAREA<br />
In aceasta etapa entitatile şi asocierile care formeaza<br />
diagrama EA se transforma pe baza unor reguli clare<br />
in structura relationala a bazei <strong>de</strong> <strong>date</strong>.<br />
Rezulta schema preliminara a acesteia formata din:<br />
tabele (relatii in terminologia relationala),<br />
coloanele acestora (atribute ale relatiilor) şi<br />
constrangerile <strong>de</strong> integritate care pot fi<br />
<strong>de</strong>duse automat din diagrama incluzand unele<br />
inter<strong>de</strong>pen<strong>de</strong>nte intre <strong>date</strong> numite şi “<strong>de</strong>pen<strong>de</strong>nţe<br />
functionale”.<br />
In cazul variantei specifice uneltelor CASE<br />
transformarea se face automat <strong>de</strong> catre acestea.<br />
F. Radulescu. Curs: <strong>Baze</strong> <strong>de</strong> <strong>date</strong> 24
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