| 摘要 |
PURPOSE: To facilitate summing-up operation definition and to efficiently carry out the summing up of data again in the case where stored data are altered by adding to each pieces of data, attribute information based upon dependency relation among the data and performing the summing up operation by using the attribute information. CONSTITUTION: According to summing-up operation definition 1, the summing-up operation is performed in time units. Time data 3 are the result of the summing-up operation performed by a time summing-up operation part 2 which sums up the collected data in one-hour units. Similarly, day data 5, month data 7 and year data 9 are obtained respectively. The attribute information showing the depth of the dependency relation is set for each piece of the data. The respective data are rearrange in the increasing order of the attribute information by using the attribute information which is recorded in the respective data and shows the depth of the dependency relation to generate a list. The summing-up operation is performed in the order of the attribute values in the obtained list. Thus, the dependency relation between the data is added as the attribute information to the data and then used for the summing-up operation, so the summing-up operation definition 1 is easy. |
