Релации

If you double-click a connection between two linked fields in the query design, or if you choose Insert - New Relation, the Relations dialog appears. These properties will be used in all queries created in the future.

Tables involved

Specifies two different tables that you want to join.

Fields involved

Specifies two data fields that will be joined by a relation.

Опции

Тип

Specifies the link type of the selected link. Queries about the various types of links differ in the number of records displayed. The following options are available:

Внатрешно сврзување

With the internal join, the results table contains only the records for which the content of the linked fields is the same. In LibreOffice SQL this type of link is created by a corresponding WHERE clause.

Лево спојување

With the left join, the results table contains all fields of the left table and only those fields of the right table for which the content of the linked fields is the same. In LibreOffice SQL this type of link corresponds to the LEFT OUTER JOIN command.

Поврзување оддесно

With the right join, the results table contains all fields of the right table and only those fields of the left table for which the content of the linked fields is the same. In LibreOffice SQL this type of link corresponds to the RIGHT OUTER JOIN command.

Full Join

For a full join, the results table contains all fields of the left and right tables. In the SQL of LibreOffice this type of link corresponds to the FULL OUTER JOIN command.

Natural

Inserts the keyword NATURAL 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.