entite_relation_intro

entite_relation_intro - Cours de Bases de donnees Anne...

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Cours de ”Bases de donn ´ ees” Ann´ ee acad´ emique 2009-2010 Le mod` ele entit´ e-relation - Introduction Exercice 1 Une biblioth` eque d´ esire informatiser sa gestion d’ouvrages. Chaque auteur a un num´ ero unique, que la biblioth` eque lui attribue. Un auteur est ´ egalement d´ ecrit par son nom et son pr´ enom. La biblioth` eque attribue ´ egalement un num´ ero unique a ses ouvrages (ISBN). Le titre et la date de parution doivent egalement ˆ etre conserv´ es. Un auteur peut ´ ecrire plusieurs ouvrages, et un ouvrage peut ˆ etre co-´ ecrit par plusieurs auteurs. On demande : 1. de concevoir un diagramme entit´ e-relation pour la base de donn´ ees de la biblioth` eque. 2. ce que devient le mod` ele si : (a) Un ouvrage ne peut ˆ etre ´ ecrit que par un auteur (b) Un ouvrage ne peut avoir au maximum que 3 co-auteurs. Exercice 2 Une soci´ et´ e X d´ esire conserver un historique de son personnel, sachant que : – Chaque membre du personnel a un num´ ero unique, un nom et un pr´ enom.
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