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046_mongodb/12_aggregate/README.md

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@@ -9,6 +9,7 @@ Aggregations operations process data records and return computed results. Aggreg
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[documenation about single purpose aggregation](https://docs.mongodb.com/manual/aggregation/#single-purpose-agg-operations)
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There are two functions you can use:
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1. [db.collection.count()](https://docs.mongodb.com/manual/reference/method/db.collection.count/#db.collection.count)
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1. db.collection.distinct()
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