Method and apparatus for data storage and interchange using a re

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3649744, 364DIG2, 3649745, 3649746, G06F 1540

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active

054148340

ABSTRACT:
A digital computer system and method for storing and retrieving data contained in a "relational data table" in such a way that individual items of data are readily accessible and the data itself is compressible. The items of data are arranged in the table in a plurality of rows and columns. The items of data in each given column are of the same type (fixed length character, variable length up to a prescribed maximum length, etc.). The items of data are arranged in a particular data format which comprises a plurality of "column descriptor" or "C" records, each of which is associated with one column of the table, followed by a plurality of "data" or "D" records which include the items of data in the table. The D records and C records contain the following information: Each D record includes one or more of the items of data from a particular table row. It is therefore associated with this table row and with at least one table column. Each C record, which is associated with one of the table columns, includes an identification of the associated column, an identification of a D record which includes an item of data in the associated column, and a number defining the absolute displacement of the beginning of the items of data arranged in the respective column with respect to the beginning of the D records associated with that column.

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