Aggregation framework

Queries with the MongoDB Aggregation Framework is not available in the Community Edition of Mongo Management Studio.

In this type of queries the results of several partial queries are merged and grouped together to form a new result. The following query returns a list of all US states, that have more than 10 million inhabitants.

[
	{ 
		$group : { 
			_id : "$state",
            totalPop : { 
				$sum : "$pop"
			} 
		} 
	},
	{ 
		$match : { 
			totalPop : {
				$gte : 10000000
			} 
		}
	}
]

The queries must be embedded in an array. Are the appropriate braces left out, it leads to an error message.

A detailed documentation of the MongoDB AggregationFramework can be found here: http://docs.mongodb.org/manual/core/aggregation-introduction/