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`monger.collection/aggregate` provides a convenient way to run [aggregation queries](http://docs.mongodb.org/manual/reference/aggregation/).
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``` clojure
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(ns my.service
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(:require [monger.collection :as mc])
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(:use monger.operators))
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;; single stage pipeline
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(mc/aggregate "docs" [{$project {:subtotal {$multiply ["$quantity", "$price"]}
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:_id "$state"}}])
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