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aggregation in mysql
Posted by: luca ghionna
Date: February 27, 2010 11:05AM

Hi there!

my question is related to the way mysql handles the optimization of aggregate/group-by queries. Conventional database usually perform the aggregation/grouping only after all joins in the query have been consumed. However, one can easily perform "early" multiple aggregations to reduce the size of relations or to count the number of tuples one needs to solve a particular aggregate. What about mysql? Which kind of optimization is provided for aggregate/group-by queries?

Thank you!

Luca.

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