aggregation in mysql
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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aggregation in mysql
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February 27, 2010 11:05AM
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