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:...
MongoDB
MongoDB: How to Query for “not null” in Specific Field
You can use the following syntax to query for all documents where a specific field is not null in MongoDB:
db.collection.find({"field_name":{$ne:null}})
The following examples show...
Aggregation in MongoDB
MongoDB: How to Find the Max Value in a Collection
You can use the following methods to find the max value of a field in MongoDB:
Method 1: Return Document that Contains Max Value
db.teams.find().sort({"field":-1}).limit(1)
This chunk...
Aggregation in MongoDB
MongoDB: How to Sort Documents By Date
You can use the following methods to sort documents by a date field in MongoDB:
Method 1: Sort by Date Ascending
db.sales.find().sort({"date_field": 1})
Method 2: Sort by...
MongoDB
MongoDB: How to Remove a Field from Every Document
You can use the following methods to remove fields from every document in a collection in MongoDB:
Method 1: Remove One Field
db.collection.updateMany({}, {$unset: {"field1":1}})
Method 2:...
MongoDB
MongoDB: How to Add a New Field in a Collection
You can use the following methods to add a new field to every document in a collection in MongoDB:
Method 1: Add New Field Without...
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