| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for deriving a sub-database selected by a user without clear awareness by the user and a query creating an approximate sub-database. SOLUTION: A query is performed for all the items of an original database, a single item query satisfying a predetermined condition is detected and allocated as a root node; using the root node as a starting point, the single item query satisfying the predetermined condition is recursively performed till when a terminal condition is detected; a tree structure is created; for all the paths of the completed tree structure, a logical product is produced from the root node to a terminal node; and the logical sum of all the logical products is made as a query deriving an approximate database. COPYRIGHT: (C)2006,JPO&NCIPI
|
