Propriétés de la jointure
Si vous double-cliquez sur le lien connectant deux champs liés dans l'ébauche de requête, ou si vous choisissez Insertion - Nouvelle relation, la boîte de dialogue Propriétés de la jointure s'affiche. Ces propriétés sont utilisées dans toutes les requêtes créées par la suite.
Tables impliquées
Indique les deux tables différentes que vous souhaitez joindre.
Champs impliqués
Indique les deux champs de données qui seront joints par une relation.
Options
Type
Specifies the join type of the selected join. Some databases support only a subset of the various possible types.
Jointure interne
In an inner join, the results table contains only those records for which the content of the linked fields is the same. In LibreOfficeDev SQL this type of link is created by a corresponding WHERE clause.
Jointure gauche
In a left join, the results table contains all records of the queried fields from the left table and only those records of the queried fields from the right table for which the content of the linked fields is the same. In LibreOfficeDev SQL this type of link corresponds to the LEFT OUTER JOIN command.
Jointure droite
In a right join, the results table contains all records of the queried fields from the right table and only those records of the queried fields from the left table for which the content of the linked fields is the same. In LibreOfficeDev SQL this type of link corresponds to the RIGHT OUTER JOIN command.
Jointure complète
In a full join, the results table contains all records of the queried fields from the left and right tables. In the SQL of LibreOfficeDev this type of link corresponds to the FULL OUTER JOIN command.
Naturel
In a natural join, the keyword NATURAL in inserted into the SQL statement that defines the relation. The relation joins all columns that have the same column name in both tables. The resulting joined table contains only one column for each pair of equally named columns.