DATA ACCUMULATION METHOD, SUMMARY GENERATION METHOD AND DATA BASE DEVICE

摘要

PROBLEM TO BE SOLVED: To efficiently accumulate required data by giving a file label corresponding to a relative data generation date given to each record data by one to one to plural physical files. SOLUTION: A data accumulation means 2 substitutes an absolute data generation date showing generated year/month/day for a circular character string formed of a number equal to the number of constitution days in a prescribed period by following the order of the absolute data generation date with respect to plural pieces of record data shown by plural call bills A. The circular character string is given in accordance with plural pieces of record data as the relative data generation date corresponding to the file labels given to the plural physical files 1a in a data storage means 1 by one to one. Plural pieces of record data are accumulated in the plural physical files 1a to which the corresponding file labels are given while the relative data generation date given to plural pieces of record data is referred to as an identifier at the time of retrieving data.