MongoDB aggregation: Neat trick to group by any time interval(nrg-media.de)
nrg-media.de
MongoDB aggregation: Neat trick to group by any time interval
http://www.nrg-media.de/2013/10/mongodb-aggregation-group-by-any-time-interval/
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http://www.nrg-media.de/2013/10/mongodb-aggregation-group-by-any-time-interval/
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