Abstract: A database system that can analyze multichannel data multilaterally so as to total data items and satisfy various detailed conditions. The system includes: a data storage unit 50 for storing data; a data base management unit for managing input/output of data to/from this data storage unit; a data processor for controlling the data base management unit to obtain predetermined data from the data storage unit and process the data; and a stored function 40 enabled to define a field value used to group data. The data processor is used to enter an execution command that specifies the stored function to be used in a data processing so as to instruct the data base management unit to total data items according to the field value defined by the stored function specified in the execution command.

Abstract: A component ratio is received for a plurality of attributes associated with a composition condition. An extractable amount of data for each attribute is determined; and a target extraction amount for each attribute is calculated based, at least partially, on the component ratio. If a target extraction amount corresponding to a given attribute exceeds an extractable amount corresponding to the same given attribute, then the target extraction amount is adjusted to a value that is equal to or less than the corresponding extractable amount while retaining the component ratio within a predetermined range.