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Friday, March 14, 2025

MongoDB

MongoDB: How to Sort by Multiple Fields

You can use the following syntax to sort documents in MongoDB by multiple fields: db.myCollection.find().sort( { "field1": 1, "field2": -1 } ) This particular code sorts...

How to Calculate the Median Value in MongoDB

You can use the following syntax to calculate the median value in MongoDB: db.teams.find().sort( {"points":1} ).skip(db.teams.count() / 2).limit(1); Note that in this example we calculate the...

MongoDB: How to Group by Date

You can use the following syntax to group documents by date in MongoDB: db.collection.aggregate() Note that day is the name of the date field that we’d...

MongoDB: How to Group By and Sum

You can use the following syntax to group by and count in MongoDB: db.collection.aggregate() Note that field_name1 is the field you’d like to group by and...

MongoDB: How to Find Document By id

You can use the following basic syntax to find a document by id in MongoDB: db.collection.find(ObjectId('619527e467d6742f66749b72')) The following examples show how to use this syntax with...

MongoDB: How to Use a “NOT IN” Query

You can use the following syntax to query for all documents where the value for a particular field is not in a certain list...

How to Find Duplicates in MongoDB

You can use the following syntax to find documents with duplicate values in MongoDB: db.collection.aggregate() Here’s what this syntax does: Group all documents having the same value...

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