Abstract: An installation for managing a database, the database having a database filter to provide the data sought in response to a query defining the filter and at least one data hierarchy of at least three hierarchical levels. The installation includes an interrogator to provide at least one query defining a filter to select data sought by using the database filter. The installation includes a representation of a hierarchy table that includes, for each hierarchised datum, the data on which it is dependent, regardless of the number of hierarchical levels separating them, the data being contained in a separate record of the table which also contains the hierarchised datum. During an interrogation on the basis of a query pertaining to hierarchised data, the database filter provides a response to the query formulated on the basis of the hierarchy table without resorting to external interrogation tools.