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multi-part key

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multi-part key - compound key


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This is a multidimensional query that requires building a multi-part key for another index or one might call for an aggregated result, for instance: what was the average sale per customer in California in December, which requires all of the above operations plus the mathematical averaging of the $AMOUNT fields from all the qualifying Orders.
Database Overload Overwhelms Database Administrators by Trowbridge, Dave / Computer Technology Review
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