Aggregation in MongoDB
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...
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...
Aggregation in MongoDB
MongoDB: How to Select Distinct Values from Multiple Fields
You can use the following syntax to select distinct values from multiple fields in MongoDB:
db.collection.aggregate(
...
Aggregation in MongoDB
MongoDB: How to Count Distinct Values in Field
You can use the following methods to count the distinct values in a specific field in MongoDB:
Method 1: Find List of Distinct Values
db.collection.distinct('field_name')
Method 2:...
Aggregation in MongoDB
MongoDB: How to Find the Max Value in a Collection
You can use the following methods to find the max value of a field in MongoDB:
Method 1: Return Document that Contains Max Value
db.teams.find().sort({"field":-1}).limit(1)
This chunk...
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