| 摘要 |
A method, apparatus, article of manufacture, and a memory structure for designing and displaying data subsets formed from a file of data records is disclosed. Data subsets are defined, and a data subset object is created that includes a list of Record IDs identifying data records that are members of the defined data subset. The data subset object belongs to a set ID class having a Record ID subclass and a subset subclass. If the Set ID class is instantiated as a subset subclass, the data records listed in the Record ID list are retrieved incrementally, according to the Record ID list. If the Set ID class is instantiated as a Record ID subclass, data records are incrementally retrieved from the data file.
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