Aggregation in 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...
Aggregation in MongoDB
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...
Aggregation in MongoDB
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...
Aggregation in MongoDB
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
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
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...
Aggregation in MongoDB
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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