| 摘要 |
PROBLEM TO BE SOLVED: To provide a data warehouse that can include an indexed database and also can store data on information stored in an external database. SOLUTION: The information extracting system that processes querys for extracting information from the database is provided with a mechanism that finds characteristics and fragments of the characteristics within the indexed database, an evaluation mechanism that evaluates repeatedly sub-querys using the characteristics and the fragment of the characteristics being found after recognizing the multi-level sub-queries being included in the query, and a mechanism that gathers the results of the repeated evaluations for the query and the sub-query succeeding the calculation of the total result of the query and also stores the results in a memory.
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