Database Tutorials

You can use the following syntax to group by and count in MongoDB: db.collection.aggregate([ {$group : {_id:”$field_name1″, count:{$sum:”$field_name2″}}} ]) Note that field_name1…

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…

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

You can use the following syntax to find documents with duplicate values in MongoDB: db.collection.aggregate([ {“$group” : { “_id”: “$field1”, “count”: {…

You can use the following syntax to select distinct values from multiple fields in MongoDB: db.collection.aggregate( [ {$group: { “_id”: { field1:…

You can use the following methods to count the distinct values in a specific field in MongoDB: Method 1: Find List of…

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…

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”:…

You can use the following methods to remove fields from every document in a collection in MongoDB: Method 1: Remove One Field…

You can use the following methods to add a new field to every document in a collection in MongoDB: Method 1: Add…