| 摘要 |
PROBLEM TO BE SOLVED: To make easily performable design, construction, and alter of a data base. SOLUTION: The data structure of the data base is defined only with items and their contents. The same management number, i.e., a record number 1 in this case is assigned to a number '00', a name 'Yamada', an age '30', and height '165' and the same record number, i.e., a record number 2 is assigned for a next number '01', a name 'Satoh', an age '25', and height '160'. Items are retrieved with a retrieval key 1 and contents are retrieved with a retrieval key 2 respectively to obtain sets of management numbers. Data whose contents of the items specified with the retrieval key 1 match the retrieval key 2 can be retrieved from a set of the management numbers obtained by ANDing the respective management numbers.
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