August 2009
Intermediate to advanced
893 pages
26h 48m
English
Content preview from Database Systems: Concepts, Design and Applications
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14.6. Statistical Database Security
Statistical database security system is used to control the access to a statistical database, which is used to provide statistical information or summaries of values based on various criteria. A statistical database contains confidential information about individuals or organisations, which is used to answer statistical queries concerning sums, averages, and numbers with certain characteristics. Thus, a statistical database permits queries that derive aggregated (statistical) information, for example, sums, averages, counts, maximums, minimums, standard deviations, means, totals, or a query such as “What is the average salary of Analysts?”, etc. They do not permit queries that derive individual information, ...
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