aggregation-framework Archives

mongodb, Programming

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Find duplicate records in MongoDB

How would I find duplicate fields in a mongo collection. I’d like to check if any of the “name” fields are duplicates. { ...

June 3, 2022
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MongoDB: Combine data from multiple collections into one..how?

How can I (in MongoDB) combine data from multiple collections into one collection? Can I use map-reduce and if so then how? I ...

May 18, 2022
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Get names of all keys in the collection

I’d like to get the names of all the keys in a MongoDB collection. For example, from this: db.things.insert( { type :...

May 11, 2022
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Retrieve only the queried element in an object array in MongoDB collection

Suppose you have the following documents in my collection: { "_id":ObjectId("562e7c594c12942f08fe4192"), "shapes":...

May 5, 2022
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Update MongoDB field using value of another field

In MongoDB, is it possible to update the value of a field using the value from another field? The equivalent SQL would be ...

May 4, 2022
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Find duplicate records in MongoDB

MongoDB SELECT COUNT GROUP BY

MongoDB: Combine data from multiple collections into one..how?

Get names of all keys in the collection

Retrieve only the queried element in an object array in MongoDB collection

Update MongoDB field using value of another field