| 摘要 |
The present invention relates to a method and a device for extracting information from a database, which comprises a plurality of data records, each data record comprising at least two data elements, each data element being defined by a data element type and a data element value. First, the data records are read into the primary memory of a computer, so that all processing of the data may be done off line. Then, the data element values are binary-coded and stored in one or more tables. When the selection of at least one data element value is detected, all binary-coded data element values are examined to obtain all data records implied by the selection. Due to the binary-coding, these data records are found very quickly. Finally the data element values implied by the selection is kept track of in a status set.
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