| 摘要 |
The invention relates to a method for controlling a relational database system by executing, using a database language, a database inquiry in a relational database which comprises as the assigned data structure a plurality of data tables interlinked by relations, a table of said relations being available. A processable database instruction without relation-specific operations is established by indicating those data tables to which the processing functions should be applied and also indicating the order of the selected data tables which should be used for processing. An access path is determined which concretely specifies an access order to the database. For this purpose, a partial access path is calculated using the table of relations between two successive, selected data tables based on the relations existing between the two successive data tables. The access path is then put together from all the calculated partial access paths. |
