HIERARCHICAL RETRIEVING SYSTEM IN RELATIONAL-TYPE DATA BASE

摘要

PURPOSE:To simply retrieve only by selecting conditions in a hierarchy-selecting way for a two-dimensional relational-type data base by analyzing the hierarchical relations among logical items from a hierarchical table and retrieving the data base for each logical item successively according to the result of the analysis. CONSTITUTION:When a hierarchical constitution is defined for the two-dimensional relational-type data base in the order of logical items 1-n, first, the conditions of the logical item 1 at a first level, 'data 11', 'data 12'... are displayed as selecting conditions. Here, when the 'data 11' as selected, the conditions of a logical item 2 at a second level, 'data 21' and 'data 22' which are defined under the 'data 11', are displayed as next selecting conditions. By repeating this until an (n)-th level, the two-dimensional relational-type data base can be retrieved hierarchically. Further, without selecting up to the (n)-th hierarchy, it may be executed to stop selecting the hierarchy halfway, and at this time, the plural numbers of data are retrieved.