Answers for "how to write the aggragation in mongodb"

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how to write the aggragation in mongodb

> db.mycol.aggregate([{$group : {_id : "$by_user", num_tutorial : {$sum : 1}}}])
{ "_id" : "tutorials point", "num_tutorial" : 2 }
{ "_id" : "Neo4j", "num_tutorial" : 1 }
>

Posted by: Guest on December-17-2020

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