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046_mongodb/12_aggregate/README.md

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@@ -10,9 +10,33 @@ Aggregations operations process data records and return computed results. Aggreg
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There are two functions you can use:
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[db.collection.count()](https://docs.mongodb.com/manual/reference/method/db.collection.count/#db.collection.count)
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#### [db.collection.count()](https://docs.mongodb.com/manual/reference/method/db.collection.count/#db.collection.count)
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[db.collection.distinct()](https://docs.mongodb.com/manual/reference/method/db.collection.distinct/#db.collection.distinct)
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syntax
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```
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db.collection.count(query, options)
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```
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| Parameter | Description |
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| --- | --- |
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| query | The query selection criteria.
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| options | Optional. Extra options for modifying the count.
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#### [db.collection.distinct()](https://docs.mongodb.com/manual/reference/method/db.collection.distinct/#db.collection.distinct)
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syntax
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```
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db.collection.distinct(field, query, options)
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```
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| Parameter | Description |
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| --- | --- |
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| field | The field for which to return distinct values.
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| query | A query that specifies the documents from which to retrieve the distinct values.
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| options | Optional. A document that specifies the options. See Options.
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### examples - count()
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```
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### examples - distinct()
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syntax
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```
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db.collection.distinct(field, query, options)
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```
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| Parameter | Description |
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| --- | --- |
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| field | The field for which to return distinct values.
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| query | A query that specifies the documents from which to retrieve the distinct values.
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| options | Optional. A document that specifies the options. See Options.
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```
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db.inventory.distinct( "dept" )
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```

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