mongodb-query Archives

arrays, Programming

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How to Update Multiple Array Elements in mongodb

I have a Mongo document which holds an array of elements. I’d like to reset the .handled attribute of all objects in the ...

May 26, 2022
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How to query nested objects?

I have a problem when querying mongoDB with nested objects notation: db.messages.find( { headers : { From: "reservations@marriott.com" } } ).count() 0 db.messages.find( ...

May 20, 2022
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How to list all databases in the mongo shell?

I know how to list all collections in a particular database, but how do I list all available databases in MongoDB shell? 7 ...

May 18, 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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Random record from MongoDB

I am looking to get a random record from a huge collection (100 million records). What is the fastest and most efficient way ...

May 8, 2022
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How to remove a field completely from a MongoDB document?

{ name: 'book', tags: { words:...

May 8, 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 objects between two dates MongoDB

I’ve been playing around storing tweets inside mongodb, each object looks like this: { "_id" : ObjectId("4c02c58de500fe1be1000005"), "contributors" : null, "text" : "Hello ...

May 3, 2022
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