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系统R的历史和评估

系统R的历史和评估

Andy
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Throughout the history of information storage in computers, one of the most readily observable trends has been the focus on data independence. C.J. Date [27] defined data independence as "immunity of applications to change in storage structure and access strategy." Modern database systems offer data independence by providing a high-level user interface through which users deal with the information content of their data, rather than the various bits, pointers, arrays, lists, etc. which are used to represent that information.
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