Duration: 20:45 min
Summary: In this video we are going to see how to perform aggregations in MongoDB. The aggregation functions of MongoDB perform only one basic operation: to count the data through the method called count(). We can also see duplicated values using the method distinct() with the option to use a filter to get only the documents we want. This video show examples of the methods count() and distinct(). Another important feature of MongoDB is the group() method in which we have more options to specify how the aggregation is performed. This video show an example of how to use the count() method with the reduce function in order to sum up the values of a field inside the documents of a collection in MongoDB.
Windows 7, MongoDB, NoSQL
: The video shows how to use the methods count(), distinct() and group()
Keywords: MongoDB, NoSQL, Database, Documents, Aggregation, Count, Group, Distinct