ACCESS_DEFINIR_LES_RELATIONS_ENTRE_TABLES

ACCESS_DEFINIR_LES_RELATIONS_ENTRE_TABLES

Access 2007 définir les relations entre tables

Comment définir les relations entre les tables sous Access en moins de 10 min.

ACCESS_DEFINIR_LES_RELATIONS_ENTRE_TABLES

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ACCESS_DEFINIR_LES_RELATIONS_ENTRE_TABLES

Une relation est un lien entre deux tables, associant des données de la première avec celles de la deuxième. Par exemple, une table peut accueillir les noms et les adresses des clients, alors qu’une autre table contient les événements gérés pour ces clients. Une fois la relation définie entre deux tables, vous pouvez créer une requête par le biais de laquelle Access affichera les noms des clients et leurs commandes en cours.

ACCESS_DEFINIR_LES_RELATIONS_ENTRE_TABLES

Access 2007 définir les relations entre tables

ACCESS_DEFINIR_LES_RELATIONS_ENTRE_TABLES

Access 2007 définir les relations entre tables

Pour établir une relation, vous identifiez les champs en correspondance dans les deux tables. Il n’est pas nécessaire qu’ils aient les mêmes noms, mais ils doivent contenir le même type de données et d’informations.

Trois situations sont possibles:

  • les relations peuvent s’établir d’un enregistrement à un seul autre (1 à 1);
  • d’un enregistrement à plusieurs autres (1 à Valeur infinie );
  • de plusieurs enregistrements à plusieurs autres (de Infini à  Infini ).

On met généralement en relation la clé primaire d’une table avec le champ correspondant dans l’autre table.

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ACCESS_DEFINIR_LES_RELATIONS_ENTRE_TABLES

Access 2007 définir les relations entre tables

 

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