MongoDB
How to Create User & add Role in MongoDB
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The concept of aggregation is to carry out a computation on the results which are returned in a query. For example, suppose you wanted to know what is the count of documents in a collection as per the query fired, then MongoDB provides the count() function.
Let's look at an example of this.
db.Employee.count()
Code Explanation:
If the command is executed successfully, the following Output will be shown
Output:
The output clearly shows that 4 documents are there in the collection.
Performing Modifications
The other two classes of operations in MongoDB are the update and remove statements.
The update operations allow one to modify existing data, and the remove operations allow the deletion of data from a collection.
In MongoDB, the db.collection.remove () method is used to remove documents from a collection. Either all of the documents can be removed from a collection or only those which matches a specific condition.
If you just issue the remove command, all of the documents will be removed from the collection.
The following code example demonstrate how to remove a specific document from the collection.
db.Employee.remove({Employeeid:22})
Code Explanation:
If the command is executed successfully, the following Output will be shown
Output:
The output will show that 1 document was modified.
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